Laminated chipboard GOST 10632 89. Chipboard: production, GOST, characteristics, dimensions. Examples of symbols

When harvesting and processing wood, approximately half of the raw materials are sent to waste, which is then not used for the production of wood masses, but forms wood pulp from which different kinds wood boards. In this article we will talk about perhaps the most popular form wood boards - chipboard.

Introduction

Aspects related to . Now we will focus on the description of the material - Chipboard (chipboard).

In the first lines, I would immediately like to make a reservation that technologists and professionals understand the abbreviation chipboard as “Wood-Laminated Plastic”; if we talk about “Wood-Particle Boards”, then the correct abbreviation would be chipboard. However, among the people the abbreviation chipboard has already taken root, like chipboard, so we will stick to the same so as not to cause confusion.

Wood waste makes up about 20% of the mass of all wood at the cutting down stage; during processing into lumber, waste in the form of sawdust, shavings, and wood fragments reaches 40%.

Of three types (hard, soft and bark) manufacturers building materials opted for sawdust and whole pieces, from which industrial chips are subsequently obtained as raw materials; from the latter, individual glued products or fragments of construction and furniture designs. Subsequently, depending on the specialized direction of production, chips are used to make shavings, crushed pieces, and fibers with the required technological parameters and characteristics for a specific production.

Innovative technologies have significantly affected the production of products from wood waste of any size and type; automated production of boards from particle boards has almost completely provided the consumer with an aesthetic, reliable and environmentally friendly product.

Chipboard is lumber in the form of flat rectangular sheets, made by high-temperature pressing of small particles of wood with binding components. These boards can be easily processed as hand tools, and on machines. In particular, they are often produced with a jigsaw with.

Sawdust, wood chips, veneer residues, fibers and other materials are used as raw materials. wood waste, their content in the product is about 90%. The binding elements are synthetic-based resins: formaldehyde, phenol-formaldehyde and others, their content in the slab is about 7-9%. Sometimes, to improve the quality of the material and give the product the necessary properties, hydrophobizing (water-repellent additives) substances, antiseptics (antibacterial additives) and fire retardants (substances that increase the material’s resistance to ignition) are added to it.

Chipboard GOST

Chipboard production technology, physical and chemical parameters, performance characteristics and other aspects are regulated by the following regulatory documents:

№	GOST	Name
1.		Particle boards. Technology. Terms and Definitions
2.		Particle boards. Method for determining impact strength
3.		Particle boards. Hardness determination method
4.
5.		Particle boards. General rules preparation and conduct of physical and mechanical tests
6.		Particle boards. Method for determining the resistivity of pulling out nails and screws
7.		Particle boards. Method for determining the specific resistance to normal tearing of the outer layer
8.		Glued wooden structures. Method for determining the strength of adhesive joints between wood-based materials and wood
9.		Particle boards. Methods for determining physical properties
10.		Particle boards. Methods for determining the tensile strength and elastic modulus in bending
11.		Particle boards and . Perforator method for determining formaldehyde content
12.		Particle boards and wood-fiber boards. Size and shape control methods
13.		Wood-fiber and particle boards. Terms and Definitions
14.		Particle boards. Specifications
15.		Particle boards. Method for determining the tensile strength perpendicular to the plate face
16.
17.		Particle boards lined with films based on thermosetting polymers

Production technology

The main raw materials for the production of chipboards are various wood wastes - substandard products, slabs, branches, chips, sawdust. Thus, the environmental value becomes clear this process– it allows you to make production waste-free, and accordingly save newly deforested areas, as well as significantly reduce the area for production waste.

The entire production process is divided into several stages:

Grinding

All wood waste goes through the stage of grinding into chips. This is done using special chipping machines. Subsequently, this mass undergoes further grinding on chipped machines to the state of chips. I distinguish two types of chips based on their location in the structure of the future slab:

for the outer layer;
for the inner layer.

In the outer layers of the slabs, smaller chips are used; accordingly, for the inner layers they can be larger.

It should be noted that it has special meaning the geometry of the chips themselves - they must be smooth, flat and have a fixed thickness. This is especially critical for the production of laminated chipboard, where the most important parameter is the quality and evenness of the surface of the material. Thus, in its production, special devices are used (mills, shredders, crushers), which make it possible to adjust the necessary qualitative indicators raw materials.

Drying

To ensure consistency of product characteristics, it is extremely important to use dried raw materials so that the moisture contained in it does not allow changes in the geometric and physical properties future slab.

Therefore, before production, it is necessary to dry the chips in special drying chambers. As with the different geometric requirements for chips for outer and inner layers, there are differences in moisture content requirements.

Division into factions

It is after drying that the chips are separated into geometric parameters for use on inner and outer layers. To do this, it is divided into fractions using special sieves or pneumatic devices. This process is very important, since its execution requires highly qualified specialists and the quality of this operation largely determines the quality of future products.

Resinization of chips

This is the process of mixing chips with a filler (binder) in special industrial devices called mixers. This process is also not simple and requires special qualifications from the master, since on the one hand the shavings must be evenly saturated with the composition, and on the other hand, an excess of the binder composition worsens the characteristics of the future product. In addition, all chips in the entire chip mass must be saturated, and not just those on the surface or in the immediate vicinity of the filler. Unresined chips will not stick together and, accordingly, form a fragile cavity in the slab, and unabsorbed resin will be excess on the tarred areas. These defects negatively affect the quality of the slab as a whole and lead to overspending. Supplies. Resinization occurs in the mixer in the form of supplying a solution of the binder component to the chip mass in the following proportions.

Recently applied new technology mixing, in which a binder component in the form of a torch is sprayed onto a moving flow of chippings. The two flows are mixed, as a result of which the resin settles on the surface of the chips and impregnates it. An important factor in this process is the ratio of the chip mass and the volume of the flow of the binder component directed to it.

Formation of chip carpet

This process is performed by special forming machines. They place the tarred shavings in a chip carpet (this is an even, uniform, continuous layer of tarred shavings of a fixed width) on special protractors. This shaving carpet is divided into packages, each of these packages will later become one chipboard slab. As noted above, the laying of the chip mass into a chip carpet should take into account the division into outer and inner layers.

Pre-compression and pre-pressing

Pre-compression allows you to make briquettes from bags - these are denser formations, have increased strength and are suitable for further transportation. There are two types of conveyors:

Pallet
Belt conveyors

As their names suggest, pallet conveyors move future products on pallets, and in the case of belt conveyors, the movement is carried out by means of a conveyor belt. Each variety has its own advantages and disadvantages. For example, the pallet option is less expensive, easier to operate and more reliable, however, when using it, the likelihood of obtaining products of different thicknesses is much higher, and there is also an increased consumption of thermal energy. Belt conveyors (palletless type of conveyor), on the contrary, have a more complex design to operate, have more high cost, but its use is more efficient in terms of energy consumption, and the product also has best characteristics according to thickness variations.

Pre-pressing

The pressing process is also important and is part of the operations on the main conveyor. Its essence is to reduce the thickness of the resulting briquette and thereby increase its transportability. When pressing, the thickness of the briquette decreases from 2 to 4 times.

Types of single-deck presses for pre-pressing:

Stationary (most common type)
Movable (mobile) press

Hot pressing

This is the most crucial moment in the entire production process chain. Since it is at this stage that the binding composition (resin) is formed and consolidated, and accordingly the final product itself appears - particle boards. Pressing is carried out on a multi-storey hydraulic press- This is the largest and most expensive unit in the entire production chain. Its height can reach 8 meters in height. In addition, the speed of its operation and productivity determines the capacity of the production site, so the most important indicator of operation is the duration of the pressing cycle.

Pressing takes place at high temperatures and under the following parameters:

Pressure (specific): from 2.5 to 3.5 MPa
Temperature: 170 to 200 degrees Celsius
Duration of the pressing cycle: from 15 to 25 seconds per 1 mm of plate thickness

In this case, the size of the slab is 6,000 x 3,000 mm. Up to 25 slabs can be produced simultaneously. It is obvious that manufacturers are striving to reduce production cycle, which can be achieved by using resins with a faster curing rate, and it is also possible to use higher temperatures. On the one hand, these factors increase the productivity of the production site, on the other hand, they can affect the quality of the products produced.

Trimming

After hot pressing, the slabs are cooled on special shelves or fans, since after the hot pressing procedure they have a long shelf life high temperature and for further processing they must be cooled. After the slabs have cooled, they go to the sawing area, where they are cut to size. After this, they must be placed in piles and remain in them for several days to consolidate and fix their physical and chemical properties.

Grinding

On final stage The surface of the slabs is leveled, various unevenness, roughness and other manufacturing defects are removed. This is especially important for slabs that will later have a laminated coating.

Production process video

This video talks about the chipboard production process.

Manufacturing Cost Reference Materials

Here are some parameters technological process chipboard production per cubic meter of product.

Name	Quantity
Wood pulp, m3	from 1.7 to 1.9
Resin, kg	from 70 to 80
Water (steam), tons	from 1.3 to 1.6
Electricity, kW/h	from 160 to 170
Labor costs, man-hours (direct production process)	from 2.5 to 5

Chipboard classification

We list the main types of classifications:

Purpose
Sheet sizes;
Sheet thickness;
Surface treatment;
Chemical composition resins;
Availability of special additives;
Toxicity class;
Grade (quality).

Let's look at these characteristics in more detail.

Purpose

Chipboard general purpose. There are no special requirements for such boards, such as water resistance or fire resistance. They are used mainly indoors and are used for the construction of partitions and the production of furniture, etc. Perhaps the main requirement is environmental friendliness, since indoors there is a restriction on the release of emitted gases into the atmosphere. harmful substances(formaldehyde). How basically these are chipboards using urea-formaldehyde resin.
Unlike general-purpose chipboards, these types of boards must have water resistance, fire safety, thermal insulation properties, water resistance, etc. As a rule, such boards are made on the basis of phenol-formaldehyde resins, less often on the basis of urea-formaldehyde resins, and appropriate additives are also used.
Chipboard special purpose. These products are produced to order and have chemical, physical properties, as well as dimensions determined by the customer.

Sheet sizes

The dimensions of chipboard sheets must comply with the current GOST. Manufacturers still adhere to this rule, however, there are cases when they deviate from it due to the fact that furniture production (or other large customers) dictate their wishes and requirements for the sheet form factor due to planning their production in order to minimize waste. Standard overall dimensions of sheets:

We also provide a table with some typical (most common) sizes of chipboard sheets.

Length, mm	Width, mm
2750	1830
2620	1830
2440	1830

Sheet thickness

Chipboard is a fairly versatile material and has a wide range of applications. There are sheets with different thicknesses. As the thickness of the sheet increases, its strength increases, but its flexibility and ductility decreases. Thus, the thickness of the sheet largely determines the scope of its application.

Thickness, mm	Purpose
from 8 to 10 mm	Decorative elements in furniture production and interior decoration
from 16 to 18 mm	Furniture production, as well as as a basis for laying floors (under linoleum and laminate)
from 22 to 25 mm	Doors, countertops, highly loaded furniture structures
from 28 to 38 mm	Production of highly loaded furniture and structural elements. For example, bar counters, massive countertops, etc.

Surface treatment

When describing the production process of particle boards, the surface treatment process was mentioned, so three main types can be distinguished:

Sanded plate. As the name implies, the surface of such plates is polished using special grinding machines, while the surface is perfectly flat and smooth. Among themselves, craftsmen call such slabs white (or simply squirrels).
Not sanded slab. Of course, the surface of the slab is processed and leveled, however, the process of fine grinding and finishing is not carried out and the quality of the surface is much inferior to ground samples.
Laminated board. These are slabs whose surfaces are covered with special films that have the following purposes:

Tinting. Films can have the required color or pattern.
Protection. The plank is waterproof, therefore it protects the slab from exposure to moisture, which is destructive.
Strength. The films are very durable and protect the surface of the slab from external mechanical influences.

Chemical composition of resin

The following types of resins can act as a binding element:

Type of resin used	Advantages	Flaws	Application
Phenol-formaldehyde	Moisture resistanceLow cost	Increased harm to humans due to the release of harmful substances in the air	Outdoor construction structures
Melamine-formaldehyde	Moisture resistanceEnvironmentally friendly	High price	Special productions
Urea-formaldehyde	Low costLow moisture resistanceLow cost	Small release of harmful substances	More than 87% of all produced chipboards are produced using this type of resin

Availability of special additives

Special additives are often added to resins to improve the physical and Chemical properties chipboard sheet.

Additive	Description
Fire retardant	This is an additive that improves the fire safety of chipboard.
Antiseptic	This is an additive that prevents the process of decay (formation of fungus, mold, etc.)
Paraffin emulsion	This is an additive that increases the moisture-resistant characteristics of the slab. The marking contains the letter “B”.

Toxicity class (formaldehyde emissions)

Since in the production process they can use not only different types resins (see “Chemical composition of resin”), but within each type there are specific manufacturers of these resins, resins may differ in composition, then additional classes of toxicity of harmful substances are introduced (presence of formaldehyde).

Toxicity class	Formaldehyde content	Harm level
E0	Practically = 0	Short
E1	up to 10 mg per 100g dry slab	Average
E2	from 10 to 30 mg per 100g dry slab	High

Video about the dangers of using chipboard in residential premises.

Grade (quality)

The grade of chipboard is a basic characteristic indicating the quality of the board.

Slab type	Description
1	The following are not allowed: · protrusions and depressions, · resin, paraffin and other stains; · chipped edges and chipping of corners.
2	The following are allowed: · chipped edges within deviations along the length (width) of the slab; · grinding defects (no more than 10% of the area); · to a greater extent (compared to the first grade) the presence of inclusions of bark and large fraction of chips.
Off-grade slab (OPN)	Will not satisfy the parameters of either the first or second grade

Reference materials

Here are some reference materials on technical and physical chipboard characteristics. They can be useful if it is necessary to calculate the volume, weight, area of sheets during transportation or ordering.

Density of chipboard

Thickness, (mm)	8	10	16	20	22	30	32	38
Density, (kg/cubic meter)	740	720	680	670	660	620	600	600

Areas and volumes of chipboard

Width, mm	Length, mm	Area, square meter	Volume (with a thickness of 10 mm), cubic meter.	Volume (with a thickness of 18 mm), cubic meter.	Volume (with a thickness of 20 mm), cubic meter.	Volume (with a thickness of 38 mm), cubic meter.
2440	1830	4,47	0,045	0,080	0,089	0,170
2750	1830	5,03	0,050	0,091	0,101	0,191
3060	1830	5,60	0,056	0,100	0,112	0,213
3060	1220	3,73	0,037	0,067	0,075	0,142
3060	610	1,87	0,019	0,036	0,037	0,071

Chipboard weight

Thickness, mm	Size, mm
Thickness, mm	2440x1830	2750x1830	3060x1830	3060x1220	3060x610
10 mm	26 kg	29 kg	33 kg	22 kg	11 kg
18 mm	33 kg	37 kg	41 kg	27 kg	14 kg
20 mm	60 kg	67 kg	75 kg	50 kg	25 kg
32 mm	86 kg	97 kg	108 kg	72 kg	36 kg

Number of sheets in packs

For transportation, chipboard sheets are packaged in bundles. The number of sheets in packs is shown in the table below.

Sheet thickness, mm	Number of sheets, pcs.
8	90
10	85
16	54
20	45
26	36

(pdf file 190 Kb)

INTERSTATE STANDARD

WOOD-BOARD BOARDS

Specifications

MKS 79.060.20

OKP 55 3400

date introduction — 2009—01—01

Preface

The goals, basic principles and basic procedure for carrying out work on interstate standardization are established by GOST 1.0-92 “Interstate standardization system. Basic provisions" and GOST 1.2-97 "Interstate standardization system. Interstate standards, rules and recommendations for interstate standardization. Procedure for development, adoption, application, updating and cancellation"

Standard information

1 DEVELOPED Technical Committee on standardization TK 121 “Wood boards”

2 INTRODUCED by the Federal Agency for Technical Regulation and Metrology

3 ADOPTED by the Interstate Council for Standardization, Metrology and Certification (Protocol No. 31 of June 8, 2007)

Short name of the country according to MK (ISO 3166) 004—97	Country code according to MK (ISO 3166) 004—97	Abbreviated name of the national standardization body
Armenia		Ministry of Trade and Economic Development
Belarus		State Standard of the Republic of Belarus
Kazakhstan		Gosstandart of the Republic of Kazakhstan
Moldova		Moldova-Standard
Russian Federation		Federal Agency for Technical Regulation and Metrology
Tajikistan		Tajikstandard
Uzbekistan		Uzstandard
Ukraine		Gospotrebstandart of Ukraine

(Changed edition, Amendment 2008)

4 This standard takes into account the main regulations of the following international and European standards:

ISO 820:1975 “Wood-based particle boards. Definition and classification" (ISO 820:1975 "Particle boards - Definition and classification", NEQ);

EH 312:2003 “Particle boards. Technical specifications" (EN 312:2003 "Particle boards - Specifications", NEQ)

5 By order Federal agency on technical regulation and metrology dated August 29, 2007 No. 219-st interstate standard GOST 10632-2007 put into effect as a national standard Russian Federation from January 1, 2009

6 INSTEAD GOST 10632-89

AMENDED (IUS No. 2 2008)

Information on the entry into force (termination) of this standard is published in the index " National standards».

Information about changes to this standard is published in the “National Standards” index, and the text of the changes is published in the “National Standards” information indexes. In case of revision or cancellation of this standard, the relevant information will be published in the information index “National Standards”

1 Application area

This standard applies to general-purpose particle boards made by hot flat pressing of wood particles mixed with a binder (hereinafter referred to as boards) used in industry and construction.

The use of slabs for specific types of products is established in agreement with national sanitary and epidemiological surveillance authorities.

The standard does not apply to slabs for special purposes, as well as to slabs with a lined or painted surface.

This standard uses normative references to the following interstate standards:

GOST 12.1.004—91 System of occupational safety standards. Fire safety. General requirements

GOST 12.1.014—84 System of occupational safety standards. Air working area. Method for measuring concentrations of harmful substances using indicator tubes

GOST 12.3.042—88 System of occupational safety standards. Woodworking production. General safety requirements

GOST 12.4.009—83 System of occupational safety standards. Fire fighting equipment for the protection of objects. Main types. Accommodation and service

GOST 12.4.011-89 System of occupational safety standards. Protective equipment for workers. General requirements and classification

GOST 427-75 Metal measuring rulers. Specifications

GOST 577-68 Dial indicators with a division value of 0.01 mm. Specifications

GOST 3560—73 Steel packaging tape. Specifications

GOST 7502-98 Metal measuring tapes. Specifications

GOST 8026-92 Calibration rulers. Specifications

GOST 10633-78 Particle boards. General rules for preparing and conducting physical and mechanical tests

GOST 10634-88 Particle boards. Methods for determining physical properties

GOST 10635-88 Particle boards. Methods for determining the tensile strength and elastic modulus in bending

GOST 10636-90 Particle boards. Method for determining the tensile strength perpendicular to the plate face

GOST 10637-78 Particle boards. Method for determining the resistivity of pulling out nails and screws

GOST 10905-86 Testing and marking plates. Specifications

GOST 11842—76 Particle boards. Method for determining impact strength

GOST 11843—76 Particle boards. Hardness determination method

GOST 14192—96 Marking of cargo

GOST 15612—85 Wood products and wood materials. Methods for determining surface roughness parameters

GOST 15846—2002 Products sent to the Far North and similar areas. Packaging, labeling, transportation and storage

GOST 18321-73 Statistical quality control. Methods for random selection of samples of piece goods

GOST 21650-76 Means for fastening packaged cargo in transport packages. General requirements

GOST 23234-78 Particle boards. Method for determining the specific resistance to normal tearing of the outer layer

GOST 24053—80 Particle boards. Furniture parts. Method for determining warp

GOST 24597-81 Packages of packaged piece goods. Main parameters and dimensions

GOST 26663—85 Transport packages. Formation using packaging tools. General technical requirements

GOST 27678—88 Chipboards and plywood. Perforator method for determining formaldehyde content

GOST 27680—88 Chipboards and wood-fiber boards. Size and shape control methods

GOST 27935-88 Wood-fiber and particle boards. Terms and Definitions

NOTE When using this standard, it is advisable to check the validity of the referenced standards in information system common use- on the official website of the Federal Agency for Technical Regulation and Metrology on the Internet or according to the annually published information index “National Standards”, which was published as of January 1 of the current year, and according to the corresponding monthly published information signs, published in this year. If the reference standard is replaced (changed), then when using this standard you should be guided by the replacing (changed) standard. If the reference standard is canceled without replacement, then the provision in which a reference is made to it is applied in the part that does not affect this reference.

3 Dimensions and classification

3.1 The nominal dimensions of the slabs and their deviations must correspond to those indicated in Table 1.

Table 1

Parameter	Value, mm	Maximum deviation, mm
Thickness	From 3 or more with gradation 1	±0.3* (for polished slabs)
		0,3/ +1,7 (for unsanded slabs)
Length	1830, 2040, 2440, 2500, 2600, 2700, 2750, 2840, 3220, 3500, 3600, 3660, 3690, 3750, 4100, 5200, 5500, 5680	±5.0
Width	1220, 1250, 1500, 1750, 1800, 1830, 2135, 2440, 2500	±5.0
* Both within one slab and within a batch of slabs. Notes 1 It is allowed to produce slabs with dimensions smaller than the nominal ones by 200 mm with a gradation of 25 mm, in an amount of no more than 5% of the batch. 2 By agreement between the manufacturer and the consumer, it is allowed to produce slabs in formats not specified in this table.

3.2 Classification

3.2.1 Plates are divided into:

according to physical and mechanical indicators - by grades P-A and P-B;
in terms of surface quality - grades I and II;
by type of surface - with a regular and fine-textured (M) surface;
according to the degree of surface treatment - polished (Ш) and unpolished;
in terms of hydrophobic properties - with normal and increased (B) water resistance;
according to formaldehyde content - into emission classes E1, E2.

3.2.2 The symbol of the slabs must include: brand designation, grade, type of surface (for slabs with a fine-textured surface), degree of surface treatment (for polished slabs), hydrophobic properties (for slabs with increased water resistance), formaldehyde emission class, nominal length, width and thickness in millimeters, the designation of this standard.

Examples symbols:

Plate grade P-A, grade I, with a fine-textured surface, polished, emission class E1, size 3500´1750´15 mm:

P-A,I, M, W, E1, 3500´ 1750 ´ 15, GOST 10632—2007

Plate grades P-B, II grade, with normal surface, unpolished, emission class E2, size 3500´1750´16 mm:

P-B,II, E2, 3500´ 1750 ´ 16, GOST 10632—2007

4 Technical requirements

4.1 Deviation from edge straightness should not be more than 1.5 mm per 1 m of edge length.

4.2 Deviation from perpendicularity of the edges of the slabs should not be more than 2 mm per 1 m of edge length.

The perpendicularity of the edges can be determined by the difference in the lengths of the diagonals of the face, which should not be more than 0.2% of the length of the slab.

4.3 The physical and mechanical properties of the slabs must comply with the standards specified in Table 2.

table 2

Indicator name	Standard for slab grades
Indicator name	P-A	P-B
1 Humidity, %:
Tn*
T in
2 Maximum density deviation within the slab, no more**	±10%
3 Swelling in thickness over 2 hours (sample size 25´25 mm), %, ( T in)***
4 Ultimate bending strength, MPa, for thickness, mm ( Tn):
from 3 to 4 incl.	13,0	14,0
» 5 » 6 »	15,0	14,0
» 7 » 13 »	14,0	12,5
"14" 20"	13,0	11,5
» 21 » 25 »	11,5	10,0
» 26 » 32 »	10,0
» 33 » 40 »
St. 40
5 Modulus of elasticity in bending, MPa, for thickness, mm ( Tn)**:
from 3 to 4 incl.	1800
» 5 » 6 »	1950
» 7 » 13 »	1800
» 14 » 20 »	1600
» 21 » 25 »	1500
» 26 » 32 »	1350
» 33 » 40 »	1200
St. 40	1050
6 Tensile strength perpendicular to the slab face, MPa, for thickness, mm ( Tn):
from 3 to 4 incl.	0,45	0,31
» 5 » 6 »	0,45	0,31
» 7 » 13 »	0,40	0,28
» 14 » 20 »	0,35	0,24
"21" 25"	0,30	0,20
» 26 » 32 »	0,25	0,17
» 33 » 40 »	0,20	0,14
St. 40	0,20	0,14
7 Resistivity normal separation of the outer layer, MPa, for thickness, mm ( Tn)**:
from 3 to 4 incl.
» 5 » 6 »
» 7 » 13 »
» 14 » 20 »
» 21 » 25 »
» 26 » 32 »
» 33 » 40 »
St. 40
8 Warp, mm ( T in)
9 Surface roughness Rm, µm, no more:
for sanded boards with normal surface
for sanded boards with fine-textured surface
for unsanded slabs**
* Tn And T in— lower and upper limits of indicators, respectively. Determined by agreement between the manufacturer and the consumer. * For slabs with increased water resistance.

Reference values of physical and mechanical parameters of particle boards are given in Appendix A.

4.4 The surface quality of the slabs must comply with the standards specified in Table 3.

Table 3

Defect according to GOST 27935	Standard for slabs
	polished, varieties		unpolished, grades

Depressions (protrusions), scratches on the surface	Not allowed	No more than 2 pieces are allowed per 1 m2 of slab surface. with a diameter of up to 20 mm and a depth (height) of up to 0.3 mm or two scratches up to 200 mm long	Allowed on an area of no more than 5% of the surface of the slab, with depth (height), mm no more than:

Paraffin, oil and binder stains	Not allowed	Spots with an area of no more than 2 cm2 are allowed on 1 m2 of the slab surface in the amount of 1 piece.
Dust and resin stains	Not allowed	Allowed on an area of no more than 2% of the slab surface	Allowed
Chipped edges	Not allowed (single units with a face depth of 3 mm or less and an edge length of 15 mm or less are not taken into account)	Allowed within deviations along the length (width) of the slab
Corner chipping	Not allowed (edge length 3 mm or less is not taken into account)	Allowed within deviations along the length (width) of the slab
Grinding defects (under-grinding, over-grinding, linear grinding marks, surface waviness)	Not allowed	Allowed area is no more than 10% of the area of each side of the slab	Not defined
Individual inclusions of bark particles on the surface of the slab size, mm, no more
Individual inclusions of large chips on the plate face size, mm:	Allowed in quantities of 5 pieces. per 1 m 2 plate size, mm:
for slabs with fine-textured surface	10—15	16—35	10—15	16—35
for slabs with normal surface	Not defined
Foreign inclusions	Not allowed
Note - Allowed for slabs with a regular surface is no more than 5 pcs. individual inclusions of bark particles per 1 m2 of slab size, mm: for grade I - from 3 to 10; for grade II - from 10 to 15.

4.5 Marking

4.5.1 Each batch of slabs must be accompanied by a quality document containing:

Name, trademark (if any) and location of the manufacturer;

Symbol of slabs;

Dimensions and number of slabs (in pieces, square and cubic meters);

Date of manufacture of the slabs;

Stamp of the technical control department.

It is allowed to apply additional markings when delivering for export.

4.5.2 The marking is applied to the edge of the slab and/or on the label of each package, and/or in the shipping documentation in the form of a clear stamp with dark dye, containing:

Name and (or) trademark of the manufacturer (if available);

National mark of conformity, if the product is certified;

Brand, grade, surface type and emission class;

Date of manufacture and shift number.

Transport marking - according to GOST 14192.

4.6 Packaging

4.6.1 The slabs are formed into packages. Slabs of the same size, brand, grade, type of surface according to the degree of processing are placed in packages.

4.6.2 Packages are formed on a pallet using top and bottom covers. Low-grade chipboards, wood-fiber boards, plywood or other material that protects products from mechanical and atmospheric influences are used as covers.

The dimensions of the upper and lower cover slabs must be no less than the dimensions of the packed slabs.

4.6.3 The height of the formed package is set taking into account the characteristics lifting mechanisms, carrying capacity of vehicles, but not more than 1000 mm and weighing no more than 5000 kg.

4.6.4 Each package is fastened with transverse straps made of steel packaging tape with a width of at least 16 mm and a thickness of at least 0.5 mm in accordance with GOST 3560. The number of straps must be at least two (for a package height of up to 500 mm) and up to six (for a package height of package over 500 mm).

4.6.5 Transport packages - in accordance with GOST 26663, GOST 24597 and other regulatory documents.

Means for fastening slabs in packaged form - in accordance with GOST 21650 and other regulatory documents.

4.6.6 By agreement with the consumer, another type of packaging is allowed.

4.6.7 Boards intended for use in the Far North and equivalent areas are packaged in accordance with GOST 15846.

5 Safety requirements and environmental protection

5.1 Boards must be manufactured using materials and components approved for their manufacture by national sanitary and epidemiological authorities.

5.2 Depending on the formaldehyde content, the boards are manufactured in two emission classes indicated in Table 4

Table 4

5.4 The production of slabs must meet safety requirements in accordance with GOST 12.1.004, GOST 12.4.009, GOST 12.1.014, GOST 12.3.042.

5.5 Persons associated with the production of slabs must be provided with funds personal protection according to GOST 12.4.011.

6 Acceptance rules

6.1 Plates are accepted in batches. A batch is considered to be the number of slabs of the same brand, size, grade, degree of processing and type of surface, the same hydrophobic properties and emission class, manufactured according to the same technological regime for a limited period of time (usually during one shift) and issued with one quality document.

6.2 Selection of slabs for quality control, dimensions and testing is carried out using a random “blind” selection method in accordance with GOST 18321.

6.3 To control dimensions, straightness, perpendicularity, surface quality and roughness (when monitoring using roughness samples), slabs are selected from each batch in the quantity indicated in Table 5.

Table 5

Batch volume, pcs.	Controlled indicator by
	3.1, 4.1, 4.2		4.3 (roughness), 4.4
	Sample size, pcs.	Acceptance number, pcs.	Sample size, pcs.	Acceptance number, pcs.
Up to 500
From 501 to 1200 incl.
» 1201 » 3200 »
» 3201 » 10000 »

6.4 To control physical and mechanical parameters (including roughness when controlled by a profilograph), slabs are selected from each batch in the quantity indicated in Table 6.

Table 6

Batch volume, pcs.	Sample size, pcs.	Acceptance constant k s
Up to 280		1,12
From 281 » 500 incl.		1,17
» 501 » 1200 »		1,24
"1201" 3200"		1,33
» 3201 » 10000 »		1,41

It is allowed to include in the sample slabs selected for control in accordance with 5.3, and also to distribute the test results of the physical and mechanical parameters of slabs manufactured according to one technological regime during one shift to the entire shift volume of workings, regardless of the grade of the slabs.

6.5 The “formaldehyde content” indicator is monitored on samples taken from one board at least once every 7 days, as well as when there is a change in the technological parameters of the production of boards or the binders used.

6.6 The batch is considered to comply with the requirements of this standard and is accepted if in the samples:

The number of slabs that do not meet the standard requirements in terms of size, straightness, perpendicularity, surface quality and roughness (when controlling roughness by samples) is less than or equal to the acceptance number established in Table 5;

The surface roughness of each sample, when controlled by a profilograph, must comply with the standards established in Table 2.

7 Test methods

7.1 General rules for testing to determine physical and mechanical parameters and sample preparation - according to GOST 10633.

7.2 Control of length, width, thickness - according to GOST 27680.

Perpendicularity control - according to GOST 27680 or by the difference in the lengths of diagonals across the face, measured with a metal tape with a division value of 1 mm according to GOST 7502.

Control of edge straightness - in accordance with GOST 27680 using a device or straight edge in accordance with GOST 8026 with a length of 1000 mm not lower than the second accuracy class and a set of styli No. 4 according to the regulatory document.

7.3 Density, maximum density deviation within the slab, humidity and thickness swelling are determined according to GOST 10634.

7.4 Ultimate strength and bending modulus of elasticity are determined according to GOST 10635.

7.5 Tensile strength perpendicular to the face of the slab is determined according to GOST 10636.

7.6 Specific resistance during normal separation of the outer layer - according to GOST 23234.

7.7 Specific resistance to pulling out screws is determined according to GOST 10637.

7.8 Warping - according to GOST 24053.

7.9 Surface roughness is determined according to GOST 15612 using a profilograph with a probe radius of 1.5 mm or using roughness samples.

7.10 The type of surface is determined from samples.

7.11 Formaldehyde content is determined according to GOST 27678. In case of disagreement in assessing product quality, tests are carried out using the photocolorimetric method according to GOST 27678.

7.12 The surface quality of the slabs is assessed visually.

7.13 Determination of the types of spots and waviness on the surface of the slab is carried out by comparison with samples approved in the prescribed manner.

The surface area of the slab covered with stains is determined as the sum of the areas of individual spots on both sides of the slab.

To determine the spot area with an accuracy of 1 cm2, use a grid with square cells with a side of 10 mm, applied on a transparent sheet material. The accuracy of drawing grid lines is ± 0.5 mm. When calculating the number of cells overlapped by a spot, cells with an overlap of more than half of their area are counted as whole, and those with an overlap of less than half are not taken into account.

7.14 The depth of the recess and the height of the protrusions are determined using a dial indicator of the ICh-10 brand according to GOST 577, fixed in a metal U-shaped bracket with cylindrical supporting surfaces radius (5 ± 1) mm and span between supports 60–80 mm.

The indicator scale is set to the zero position when installing the bracket on a straight edge in accordance with GOST 8026 or a calibration plate in accordance with GOST 10905.

The stroke of the indicator rod in both directions from the reference plane must be at least 2 mm.

7.15 Linear dimensions bark inclusions, large shavings, stains, corner chipping, edge chipping and the length of scratches are determined using a metal ruler in accordance with GOST 427.

8 Transportation and storage

8.1 The slabs are transported by all modes of transport in accordance with the rules for the carriage of goods in force for this type of transport with mandatory protection from precipitation and mechanical damage.

8.2 The slabs are stored in clean, closed rooms in a horizontal position in stacks up to 4.5 m high, consisting of stacks or packages separated by spacer bars with a thickness and width of at least 80 mm and a length of at least the width of the slab, or on pallets.

The difference in thickness of the gaskets used for one foot or package is allowed to be no more than 5 mm.

Spacer bars are laid across the slabs at intervals of no more than 600 mm in the same vertical planes.

The distance from the outer spacer bars to the ends of the slab should not exceed 250 mm.

9 Manufacturer's warranty

9.1 The manufacturer guarantees that the slabs comply with the requirements of this standard, subject to storage and transportation conditions, for a period of 12 months from the date of manufacture.

Appendix A

(informative)

Physical and mechanical properties of particle boards

Table A.1

Indicator name	Value for slab grade		Test method
	P-A	P-B
Density, kg/m3	550—820		According to GOST 10634
Swelling in thickness over 24 hours (sample size 100´100 mm), %, no more			According to GOST 10634
Specific resistance to pulling out screws, N/mm, ( Tn):			According to GOST 10637
made of plastic	55—35
from the edge	45—30
Impact strength, J/m 2	4000—8000		According to GOST 11842
Hardness, MPa	20—40		According to GOST 11843

Appendix B

Application of particle boards of various formaldehyde emission classes

Table B.1

Annex 1

polished, varieties

unpolished, grades

Indentations (protrusions) or scratches on the surface

Not allowed

No more than two recesses with a diameter of up to 20 are allowed per 1 m surface.

Allowed on an area of no more than 5% of the surface of the slab, with depth (height), mm, no more than:

mm and up to 0.3 mm deep or two scratches up to 200 mm long

Paraffin, oil and binder stains

Spots with an area of no more than 1 cm are allowed on 1 m of the slab surface in the amount of 2 pieces.

Dust and resin stains

Allowed on an area of no more than 2% of the slab surface

Allowed

Chipped edges

Not allowed (single units with a face depth of 3 mm or less and an edge length of 15 mm or less are not taken into account)

Allowed within deviations along the length (width) of the slab

Corner chipping

Not allowed (edge length 3 mm or less is not taken into account)

Allowed within deviations along the length (width) of the slab

Grinding defects (under-grinding, over-grinding, linear grinding marks, surface waviness)

Not allowed

Allowed with an area of no more than 10% of the area of each face

Not defined

Individual inclusions of bark particles on the surface of the slab size, mm, no more

Individual inclusions of large chips:

for slabs with fine-textured surface

Allowed in quantities of 5 pieces. per 1 m slab size, mm:

for slabs with normal surface

Not defined

Foreign inclusions

Not allowed

Note. Allowed for slabs with a regular surface no more than 5 pcs. individual inclusions of bark particles per 1 m of slab size, mm: for grade I more than 3 to 10; for grade II - more than 10 to 15.

1.8. Depending on the formaldehyde content, the boards are manufactured in two emission classes, indicated in Table 4.

Table 4


Formaldehyde emission class
	Up to 10 incl.
	St. 10 "30"

1.5-1.8.

1.9. The symbol for the slabs indicates:

brand;

variety;

type of surface (for slabs with a fine-textured surface);

degree of surface treatment (for polished slabs);

hydrophobic properties (for slabs of increased water resistance);

formaldehyde emission class;

length, width and thickness in millimeters;

designation of this standard.

Examples of symbols:

slab brand P-A first grades with a fine-textured surface, polished, emission class E1, dimensions 3500x1750x15 mm:

P-A, I, M, Sh, E1, 3500x1750x15, GOST 10632-89.

The same, brand slabs P-B second grades with a regular surface, unpolished, emission class E2, dimensions 3500x1750x16 mm:

P-B, II, E2, 3500x1750x16, GOST 10632-89.

1.10. A marking containing:

name and (or) trademark of the manufacturer;

brand, grade, surface type and emission class;

date of manufacture and shift number.

Boards for export are marked according to regulatory and technical documentation.

Certified products are marked with a national mark of conformity in accordance with GOST R 50460 *.
_________________
*Valid on the territory of the Russian Federation.

(Changed edition, Amendment No. 1).

1.11. Boards intended for use in the Far North and equivalent areas are packaged in accordance with GOST 15846.

For export, slabs are packaged in accordance with the requirements of foreign economic organizations.

2. ACCEPTANCE RULES

2.1. Plates are accepted in batches. The batch must consist of slabs of the same brand, size, grade, degree of processing and type of surface, the same hydrophobic properties and emission class, manufactured according to the same technological regime for a limited period of time (usually during one shift) and issued with one quality document, containing:

name of the organization in whose system the manufacturer is included;

name and (or) trademark of the manufacturer and its address;

symbol of slabs;

average density slab batches in kilograms per cubic meter;

number of slabs in a batch in pieces and square meters;

technical control stamp.

2.2. The quality and dimensions of the slabs in the batch are checked by selective control.

2.3. During random control, slabs are selected “blindly” according to GOST 18321.

2.4. To control dimensions, straightness, perpendicularity, surface quality and roughness (when monitoring using roughness samples), slabs are selected from each batch, depending on its volume, in the quantity indicated in Table 5.

Table 5



Batch size	Controlled indicators by point:
	1.2, 1.3, 1.4		1.6 (roughness), 1.7
	sample size	acceptance number	sample size	acceptance number

From 501 "1200
" 1201 " 3200
" 3201 " 10000

2.5. To control physical and mechanical parameters (including roughness when monitoring it with a profilograph), slabs are selected from each batch, depending on its volume, in the quantity indicated in Table 6.

It is allowed to include in the sample slabs selected for control according to clause 2.4, and also to distribute the test results of the physical and mechanical parameters of slabs manufactured using one technological regime during one shift to the entire shift volume of workings, regardless of the grade of the slabs.

Table 6


Batch volume, pcs.	Sample size, pcs.	Acceptance constant

From 281 "500
" 501 " 1200
" 1201 " 3200
" 3201 " 10000

2.6. The “formaldehyde content” indicator is monitored at least once every 7 days on samples taken from one slab.

2.7. The batch is considered to comply with the requirements of this standard and is accepted if, in the samples:

the number of slabs that do not meet the standard requirements in terms of size, straightness, perpendicularity, surface quality and roughness (when controlled by roughness samples) is less than or equal to the acceptance number established in Table 5;

the values of and calculated using formulas (1) and (2) for each physical and mechanical indicator are equal to or more than the acceptance constant (Table 6).

where is the sample average, calculated based on the test results of all slabs in the sample;

- lower limit of indicators according to Table 2;

- upper limit of indicators according to Table 2;

- average standard deviation, calculated from the average values of all tested slabs.

Results are rounded to the second decimal place.

An example of calculating the value is given in Appendix 2;

the formaldehyde content according to the results of the last control corresponds to the standards established in Table 4;

the density of each slab is within the limits established in clause 1.6 and should not be lower than that specified in the quality document by more than 12%.

The surface roughness of each sample, when controlled by a profilograph, must comply with the standards established in Table 2.

(Changed edition, Amendment No. 1).

Interstate standard GOST 10632-2007
"Particleboards. Technical specifications"
(put into effect by order of the Federal Agency for Technical Regulation and Metrology dated August 29, 2007 N 219-st)

Wood particle boards. Specifications

Instead of GOST 10632-89

1 area of use

This standard applies to general-purpose particle boards made by hot flat pressing of wood particles mixed with a binder (hereinafter referred to as boards) used in industry and construction.

The use of slabs for specific types of products is established in agreement with national sanitary and epidemiological surveillance authorities.

The standard does not apply to slabs for special purposes, as well as to slabs with a lined or painted surface.

2 Normative references

This standard uses normative references to the following interstate standards:

GOST 12.1.004-91 System of occupational safety standards. Fire safety. General requirements

GOST 12.1.014-84 System of occupational safety standards. Work area air. Method for measuring concentrations of harmful substances using indicator tubes

GOST 12.3.042-88 System of occupational safety standards. Woodworking production. General safety requirements

GOST 12.4.009-83 System of occupational safety standards. Fire fighting equipment for the protection of objects. Main types. Accommodation and service

GOST 12.4.011-89 System of occupational safety standards. Protective equipment for workers. General requirements and classification

GOST 427-75 Metal measuring rulers. Specifications

GOST 577-68 Dial indicators with a division value of 0.01 mm. Specifications

GOST 3560-73 Steel packaging tape. Specifications

GOST 7502-98 Metal measuring tapes. Specifications

GOST 8026-92 Calibration rulers. Specifications

GOST 10633-78 Particle boards. General rules for preparing and conducting physical and mechanical tests

GOST 10634-88 Particle boards. Methods for determining physical properties

GOST 10635-88 Particle boards. Methods for determining the tensile strength and elastic modulus in bending

GOST 10636-90 Particle boards. Method for determining the tensile strength perpendicular to the plate face

GOST 10637-78 Particle boards. Method for determining the resistivity of pulling out nails and screws

GOST 10905-86 Testing and marking plates. Specifications

GOST 11842-76 Particle boards. Method for determining impact strength

GOST 11843-76 Particle boards. Hardness determination method

GOST 14192-96 Marking of cargo

GOST 15612-85 Products made of wood and wood materials. Methods for determining surface roughness parameters

GOST 15846-2002 Products sent to the Far North and equivalent areas. Packaging, labeling, transportation and storage

GOST 18321-73 Statistical quality control. Methods for random selection of samples of piece goods

GOST 21650-76 Means for fastening packaged cargo in transport packages. General requirements

GOST 23234-78 Particle boards. Method for determining the specific resistance to normal tearing of the outer layer

GOST 24053-80 Particle boards. Furniture parts. Method for determining warp

GOST 24597-81 Packages of packaged piece goods. Main parameters and dimensions

GOST 26663-85 Transport packages. Formation using packaging tools. General technical requirements

GOST 27678-88 Chipboards and plywood. Perforator method for determining formaldehyde content

GOST 27680-88 Chipboards and wood-fiber boards. Size and shape control methods

GOST 27935-88 Wood-fiber and particle boards. Terms and Definitions

Note- When using this standard, it is advisable to check the validity of the reference standards in the public information system - on the official website of the Federal Agency for Technical Regulation and Metrology on the Internet or according to the annually published information index "National Standards", which was published as of January 1 of the current year, and according to the corresponding monthly information indexes published in the current year. If the reference standard is replaced (changed), then when using this standard you should be guided by the replacing (changed) standard. If the reference standard is canceled without replacement, then the provision in which a reference is made to it is applied in the part that does not affect this reference.

3 Dimensions and classification

3.1 The nominal dimensions of the slabs and their deviations must correspond to those indicated in Table 1.

Table 1

In millimeters

┌────────────┬────────────────────────────────────┬─────────────────────┐

│ Parameter │ Value │Limit deviation│

├────────────┼────────────────────────────────────┼─────────────────────┤

│Thickness │ From 3 or more with gradation 1 │ +-0.3 │

│ │ │ (for polished │

│ │ │ slabs) │

│ │ │ -0,3/+1,7 │

│ │ │ (for unpolished │

│ │ │ slabs) │

│Length │1830, 2040, 2440, 2500, 2600, 2700, │ +-5.0 │

│ │2750, 2840, 3220, 3500, 3600, 3660, │ │

│ │3690, 3750, 4100, 5200, 5500, 5680 │ │

│Width │1220, 1250, 1500, 1750, 1800, 1830, │ +-5.0 │

│ │2135, 2440, 2500 │ │

├────────────┴────────────────────────────────────┴─────────────────────┤

│* Both within one slab and within a batch of slabs. │

│Notes │

│1 It is allowed to produce slabs with dimensions smaller than the nominal ones by 200 mm with │

│gradation of 25 mm, in an amount of no more than 5% of the batch. │

│2 By agreement between the manufacturer and the consumer, it is allowed to produce │

│slabs of formats not specified in this table. │

3.2 Classification

3.2.1 Plates are divided into:

According to physical and mechanical indicators - for grades P-A and P-B;

In terms of surface quality - grades I and II;

According to the type of surface - with a regular and fine-textured (M) surface;

According to the degree of surface treatment - polished (Ш) and unpolished;

According to hydrophobic properties - with normal and increased (B) water resistance;

Examples of symbols:

Plate grade P-A, grade I, with a fine-textured surface, polished, emission class E1, size 3500x1750x15 mm:

P-A, I, M, Sh, E1, 3500x1750x15, GOST 10632-2007

Plate grade P-B, grade II, with a regular surface, unpolished, emission class E2, size 3500x1750x16 mm:

P-B, II, E2, 3500x1750x16, GOST 10632-2007

4 Technical requirements

4.1 Deviation from edge straightness should not be more than 1.5 mm per 1 m of edge length.

4.2 Deviation from perpendicularity of the edges of the slabs should not be more than 2 mm per 1 m of edge length.

The perpendicularity of the edges can be determined by the difference in the lengths of the diagonals of the face, which should not be more than 0.2% of the length of the slab.

4.3 The physical and mechanical properties of the slabs must comply with the standards specified in Table 2.

table 2

┌────────────────────────────────────────────────────┬──────────────────┐

│Indicator name │ Standard for slabs │

│ │ marks │

│ ├────────┬─────────┤

│ │ P-A │ P-B │

├────────────────────────────────────────────────────┼────────┴─────────┤

│1 Humidity, %: │ │

│Т_в │ 13 │

├────────────────────────────────────────────────────┼──────────────────┤

│2 Maximum density deviation within the slab, │ +-10% │

├────────────────────────────────────────────────────┼────────┬─────────┤

│3 Thickness swelling in 2 hours (sample size │ 12 │ 15 │

│4 Bending strength, MPa, for thickness, mm │ │ │

│(T_n): │ │ │

│from 3 to 4 inclusive. │ 13.0 │ 14.0 │

│ " 5 " 6 " │ 15,0 │ 14,0 │

│ " 7 " 13 " │ 14,0 │ 12,5 │

│ " 14 " 20 " │ 13,0 │ 11,5 │

│ " 21 " 25 " │ 11,5 │ 10,0 │

│ " 26 " 32 " │ 10,0 │ 8,5 │

│ " 33 " 40 " │ 8,5 │ 7,0 │

│ St. 40 │ 7.0 │ 5.5 │

├────────────────────────────────────────────────────┼────────┼─────────┤

│5 Modulus of elasticity in bending, MPa, for thickness, mm │ │ │

│from 3 to 4 inclusive. │ 1800 │ - │

│ " 5 " 6 " │ 1950 │ - │

│ " 7 " 13 " │ 1800 │ - │

│ " 14 " 20 " │ 1600 │ - │

│ " 21 " 25 " │ 1500 │ - │

│ " 26 " 32 " │ 1350 │ - │

│ " 33 " 40 " │ 1200 │ - │

│ St. 40 │ 1050 │ - │

│6 Tensile strength perpendicular to │ │ │

│plate face, MPa, for thickness, mm (T_n): │ │ │

│from 3 to 4 inclusive. │ 0.45 │ 0.31 │

│ " 5 " 6 " │ 0,45 │ 0,31 │

│ " 7 " 13 " │ 0,40 │ 0,28 │

│ " 14 " 20 " │ 0,35 │ 0,24 │

│ " 21 " 25 " │ 0,30 │ 0,20 │

│ " 26 " 32 " │ 0,25 │ 0,17 │

│ " 33 " 40 " │ 0,20 │ 0,14 │

│ St. 40 │ 0.20 │ 0.14 │

│7 Specific resistance to normal tearing │ │ │

│outer layer, MPa, for thickness, mm (T_n): │ │ │

│from 3 to 4 inclusive. │ 0.8 │ - │

│ " 5 " 6 " │ 0,8 │ - │

│ " 7 " 13 " │ 0,8 │ - │

│ " 14 " 20 " │ 0,8 │ - │

│ " 21 " 25 " │ 0,8 │ - │

│ " 26 " 32 " │ 0,8 │ - │

│ " 33 " 40 " │ 0,8 │ - │

│ St. 40 │ 0.8 │ - │

│8 Warping, mm (T_v) │ 1.2 │ 1.6 │

│9 Surface roughness Rm, µm, not │ │ │

│more: │ │ │

│for polished slabs with normal surface │ 50 │ 63 │

│for polished boards with a fine-textured surface│ 32 │ 40 │

4.4 The surface quality of the slabs must comply with the standards specified in Table 3.

Table 3

┌─────────────────┬─────────────────────────────────────────────────────┐

│ Defect according to │ Standard for slabs │

│ GOST 27935 ├────────────────────────────┬─────── ────────── ───────┤

│ │ polished, grades │ unpolished, grades │

│ ├───────────┬────────────────┼────────────┬───────────┤

│ │ I │ II │ I │ II │

├─────────────────┼───────────┼────────────────┼────────────┴───────────┤

│Recesses │Not │Allowed on │Allowed on the area │

│(protrusions), │allowed│1 m2 of surface│no more than 5% of the surface │

│scratches on │ │slabs no more than 2│slabs, │ deep

│plastics │ │pcs. diameter up to│(height), mm, no more:│

│ │ │20 mm and depth│ │ │

│ │ │(height) up to 0.3│ 0.5 │ 0.8 │

│ │ │mm or two │ │ │

│ │ │scratches length │ │ │

│ │ │up to 200 mm │ │ │

├─────────────────┼───────────┼────────────────┴────────────┼───────────┤

│Paraffin and │Not │Allowed per 1 m2 │Allowed│

│oil stains, and│are allowed│spots on the surface of the slab │on the area │

│also spots from │ │with an area of no more than 2 cm2 in │no more than 2%│

│binder │ │amount of 1 pc. │surfaces│

│ │ │ │slabs │

├─────────────────┼───────────┼────────────────┬────────────┴───────────┤

│Dust-resin │Not │Allowed for │ Allowed │

│spots │allowed│area no more than│ │

│ │ │2% of surface │ │

│ │ │slabs │ │

├─────────────────┼───────────┼────────────────┴────────────────────────┤

│Chips of edges │Not │Allowed within deviations according to │

│ │allowed│length (width) of the slab │

│ │(single │ │

│ │depth by│ │

│ │layers 3 mm│ │

│ │or less │ │

│ │extended-│ │

│ │by │ │

│ │edge 15 │ │

│ │mm and less │ │

│ │not │ │

│ │taken into account│ │

│ │) │ │

├─────────────────┼───────────┼─────────────────────────────────────────┤

│Chipping │Not │Allowed within deviations according to │

│angles │allowed│length (width) of the slab │

│ │(length along │ │

│ │edge 3 mm│ │

│ │or less │ │

│ │taken into account│ │

│ │) │ │

├─────────────────┼───────────┼────────────────┬────────────────────────┤

│Defects │Not │Allowed │Do not define │

│grinding │allowed│no area │ │

│(under-grinding, │ │more than 10% │ │

│grinding, │ │the area of each │ │

│linear marks from│ │the side of the slab │ │

│grinding, │ │ │ │

│waviness │ │ │ │

│surface) │ │ │ │

├─────────────────┼───────────┼────────────────┼────────────┬───────────┤

│Individual │ 3 │ 10 │ 3 │ 10 │

│particle inclusions │ │ │ │ │

│crust on the surface │ │ │ │ │

│slabs of size, │ │ │ │ │

│mm, no more than │ │ │ │ │

├─────────────────┼───────────┴────────────────┴────────────┴───────────┤

│Individual │Allowed in quantities of 5 pieces. per 1 m2 of slab surface │

│inclusions of large│size, mm: │

│chips on the face│ │

│slabs size, │ │

│mm: │ │

│ │ │ │ │ │

│for slabs with │ 10-15 │ 16-35 │ 10-15 │ 16-35 │

│fine-textured │ │ │ │ │

│surface │ │ │ │ │

│ │ │ │ │ │

│for slabs with │ Not defined │

│regular │ │

│surface │ │

│Outsiders │ Not allowed │

│on │ │

├─────────────────┴─────────────────────────────────────────────────────┤

│Note- Allowed for slabs with a regular surface no more than 5 pcs.│

│individual inclusions of bark particles per 1 m2 of slab size, mm: for │

│I grade - from 3 to 10; for grade II - from 10 to 15. │

└───────────────────────────────────────────────────────────────────────┘

4.5 Marking

4.5.1 Each batch of slabs must be accompanied by a quality document containing:

Name, trademark (if any) and location of the manufacturer;

Symbol of slabs;

Dimensions and number of slabs (in pieces, square and cubic meters);

Date of manufacture of the slabs;

Stamp of the technical control department.

It is allowed to apply additional markings when delivering for export.

4.5.2 The marking is applied to the edge of the slab and/or on the label of each package, and/or in the shipping documentation in the form of a clear stamp with dark dye, containing:

Name and (or) trademark of the manufacturer (if available);

National mark of conformity, if the product is certified;

Brand, grade, surface type and emission class;

Date of manufacture and shift number.

Transport marking - according to GOST 14192.

4.6 Packaging

4.6.1 The slabs are formed into packages. Slabs of the same size, brand, grade, type of surface according to the degree of processing are placed in packages.

The dimensions of the upper and lower cover slabs must be no less than the dimensions of the packed slabs.

4.6.3 The height of the formed package is set taking into account the characteristics of lifting mechanisms, the carrying capacity of vehicles, but not more than 1000 mm and weighing no more than 5000 kg.

4.6.5 Transport packages - in accordance with GOST 26663, GOST 24597 and other regulatory documents.

Means for fastening plates in packaged form - in accordance with GOST 21650 and other regulatory documents.

4.6.6 By agreement with the consumer, another type of packaging is allowed.

4.6.7 Boards intended for use in the Far North and equivalent areas are packaged in accordance with GOST 15846.

5 Safety requirements and environmental protection

5.1 Boards must be manufactured using materials and components approved for their manufacture by national sanitary and epidemiological authorities.

5.2 Depending on the formaldehyde content, the boards are manufactured in two emission classes indicated in Table 4

Table 4

┌──────────────────────────────────┬────────────────────────────────────┐

│ Formaldehyde emission class │Formaldehyde content, mg per │

│ │ 100 g absolutely dry slab │

│ E1 │ Up to 8.0 incl. │

├──────────────────────────────────┼────────────────────────────────────┤

│ E2 │ St. 8.0 to 30.0 incl. │

├──────────────────────────────────┴────────────────────────────────────┤

│Note- Formaldehyde content is valid for slab humidity │

│W = 6.5%. │

│For slabs with different humidity (for humidity range from 5% to 10%) │

│the formaldehyde content indicated in the table must be multiplied by │

│coefficient F, which is calculated by the formula │

│ F = -0.133 x W + 1.86. (1)│

5.4 The production of slabs must meet safety requirements in accordance with GOST 12.1.004, GOST 12.4.009, GOST 12.1.014, GOST 12.3.042.

5.5 Persons associated with the production of slabs must be provided with personal protective equipment in accordance with GOST 12.4.011.

6 Acceptance rules

6.2 Selection of slabs for quality control, dimensions and testing is carried out using a random “blind” selection method in accordance with GOST 18321.

Table 5

┌────────────────────────┬──────────────────────────────────────────────┐

│ Batch volume │ Controlled indicator by │

│ ├─────────────────────────┬────────────────────┤

│ │ 3.1, 4.1, 4.2 │4.3 (roughness),│

│ │ │ 4.4 │

│ ├────────────┬────────────┼──────────┬─────────┤

│ │ Volume │ Acceptance │ Volume │Acceptance │

│ │ samples │ number │ samples │number│

├────────────────────────┼────────────┼────────────┼──────────┼─────────┤

│Up to 500 │ 8 │ 1 │ 13 │ 3 │

│ │ │ │ │ │

│From 501 to 1200 incl. │ 13 │ 2 │ 20 │ 3 │

│ │ │ │ │ │

│ " 1201 " 3200 " │ 13 │ 2 │ 32 │ 5 │

│ │ │ │ │ │

│ " 3201 " 10000 " │ 20 │ 3 │ 32 │ 5 │

└────────────────────────┴────────────┴────────────┴──────────┴─────────┘

6.4 To control physical and mechanical parameters (including roughness when controlled by a profilograph), slabs are selected from each batch in the quantity indicated in Table 6.

Table 6

┌───────────────────────┬───────────────────────┬───────────────────────┐

│ Batch volume, pcs. │ Sample size, pcs. │ Acceptance constant │

│ │ │ k_s │

├───────────────────────┼───────────────────────┼───────────────────────┤

│Up to 280 │ 3 │ 1.12 │

│From 281 "500 incl. │ 4 │ 1.17 │

│ " 501 " 1200 " │ 5 │ 1,24 │

│ " 1201 " 3200 " │ 7 │ 1,33 │

│ " 3201 " 10000 " │ 10 │ 1,41 │

└───────────────────────┴───────────────────────┴───────────────────────┘

6.5 The indicator “formaldehyde content” is monitored on samples taken from one board at least once every 7 days, as well as when there is a change in the technological parameters of the production of boards or the binders used.

6.6 The batch is considered to comply with the requirements of this standard and is accepted if in the samples:

The values of Q_н and Q_в, calculated using formulas (2) and (3) for each physical and mechanical indicator, are equal to or more than the acceptance constant indicated in Table 6.

Q = ──────; (2)

Q = ──────, (3)

where X is the sample mean calculated from the results

testing all slabs in the sample;

T - lower limit of indicators according to table 2;

T - upper limit of indicators according to table 2;

S - standard deviation calculated from the average

values of all tested slabs.

Results are rounded to the second decimal place;

The surface roughness of each sample, when controlled by a profilograph, must comply with the standards established in Table 2.

7 Test methods