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News
30 January 2017
Russian timber industry news #22/23-2016

In December, 2016, the Techpromplit company opens a birch veneer plant in Vyshny Volochyok

26 November 2016
Veneer production launched

Our group of companies has launched production of birch rotary cut veneer in Tver region.

11 May 2016
New seasonal offers

Variety of new product lines added - make sure to check them out and get in touch with our managers

17 April 2016
Batimat 2016

Round table discussions at BATIMAT 2016

08 February 2016
Specialized exhibition for Construction Materials in Russia 2016

Representatives of the TEHPROMPLIT visited a specialized exhibition for Construction Materials in Russia 2016 (OSM 2016)




 
Offers

23 January 2017
Birch veneer rotary cut

Prices start from 150 Euro/m3 FCA mill.






02 March 2015
Spring Birch plywood offers in 5x5 and 4x8

Birch plywood from 250 EURO/m3 FCA mill.




Articles


 


Interior plywood 5x5

Producers

Intergovernmental standard GOST 3916.1-96

Fotos



Our company can offer good quality interior birch plywood 1525*1525 and grades (BB/BB, BB/CP, CP/CP, C/C).

We cooperate with the best plywood factories in Russia. Our suppliers are one of largest manufacturers; as a result we can save lower prices for products. You can check our suppliers in section “Plywood manufactures” on our web-site.

We supply high quality plywood with reasonable prices and professional service.  

You can buy 5 sheets for your country house or 1-2 trucks and more, be sure we always give the best price for you.

Here is a description of available plywood grades in birch plywood interior glue. These grades are also applicable for exterior birch plywood.

B/BB: Single piece face and back veneer. Face veneers are considered clear and free of defects with a light-uniform color. Back allows 3-6 color matched patches, which are oval in shape and egg sized. Inner cores are solid birch single piece veneers.

 

BB/BB: Single piece face and back. Both face and back veneers allow 3-6 small color-matched patches on average and some light mineral streaks. Tight pin knots may be present. Inner cores are solid single piece veneers.

 

BB/CP: Single piece face and back. The “CP” back veneers are downgraded from “BB” grade veneers, which allow for unlimited patches and sound knots, but does not allow for open defects. Inner cores are solid birch single piece veneers.

 

CP/CP: Single piece face and back. Face and back grade veneers allow unlimited sound knots and repaired splits and unlimited patches. The panel is sound both sides and designed for laminating.

 

C/C: Patches, open knots, and small veneer splits allowed. Veneer lap and small core voids permitted. This panel is not sanded and would be used for structural purposes.

Russia always has a large number of plywood mills which produce birch plywood. The mail plywood factories are located in the central part of  Russia. All plywood manufactories can be separated on different dimensions, sizes and types of plywood.

1525x1525

-    “Sveza Ltd.” – Fanplit 1, 2, Perm plywood factory, Manturovo and Novator
-    JSC “Murom”
-    “Krasniy Yakor  Ltd.”
-    “Nelidovo DOK”
-    “Maksatiha Ltd.”
-    Yartsevo plywood factory
-    “Vlast’ truda Ltd.”
-    Solikamsk plywood factory
-    Arkhangelsk plywood factory
-    Sotameko
-    JSC “Belaya Berezka”

Plywood with faces in hardwood veneer for general use

 

Contents

 

DESCRIPTION - GENERAL USE PLYWOOD
CLASSIFICATION AND DIMENSIONS
TECHNICAL REQUIREMENTS
RULES OF ACCEPTANCE
CONTROL METHODS
TRANSPORTATION AND STORAGE
PRODUCERS GUARANTEE

 

Table: DESCRIPTION AND LIMITATIONS OF PLYWOOD DEFECTS

 

 

Specifications

 

 

1. Description - general use plywood

 

This standard covers general use plywood with hardwood face veneer.
This standard is not applicable to specialty or decorative plywood.
Minimal requirements relating to the formaldehyde emission of plywood are covered in 4.3 and 6.8.

 

 

3. Classification and dimensions


3.1. Plywood is subdivided into grades based on the following: appearance of face veneers, glue bond, the degree of moisture resistance of the bond, and if sanded or not.


3.1.1. The plywood is subdivided into 5 grades, based on the appearance of the face veneers: E (elite), I, II, III and IV. Descriptions of the face grades of the plywood are specified in Supplement A.

 

3.1.2. The degree of moisture resistance of the plywood bond is specified by the following marks:


— FSF - water proof plywood (WBP)
— FK - water resistant plywood (MR)


3.1.3. The sanding if the plywood is specified as follows:

 

— Not sanded (NS)
— Sanded one side (S1)
— Sanded two sides (S2)


3.2. Dimensions.


3.2.1. The dimensions and the number of plies in the plywood sheets must correspond to tables 1 and 2.

 


TABLE 1. Dimensions (millimeters)

 

Lengt(width) of the plywood sheets

Min(Max)Tolerance in mm

                 1200,1220,1250                 

+/- 3,0

1500,1525,1800,1830

+/- 4,0

            2100,2135,2440,2500            

+/- 4,0

2700,2745,3050,3600,3660

+/- 6,0

 

Note: Production of plywood is allowed in other dimensions corresponding with the terms of a contract.

 


TABLE 2. Thickness (millimeters)

 

Nominal thickness of plywood

Number of plies

Sanded Plywood Tolerance Min/Max(mm)

Sanded Plywood Thickness Variance(mm)

Unsanded Plywood Tolerance Min/Max (mm)

Unsanded Plywood Thickness Variance(mm)

3,0 mm

3-ply

+ 0,3/-0,4

 

+ 0,4/-0,3

 

4,0 mm

3-ply

+ 0,3/-0,5

 

+ 0,8/-0,4

 

6,5 mm

5-ply

+ 0,4/-0,5

 

+ 0,9/-0,4

1,0

9,0 mm

7-ply

+ 0,4/-0,6

 

+ 1,0/-0,5

 

12,0 mm

9-ply

+ 0,5/-0,7

0,6

+ 1,1/-0,6

 

15,0 mm

11-ply

+ 0,6/-0,8

 

+ 1,2/-0,7

 

18,0 mm

13-ply

+ 0,7/-0,9

 

+ 1,3/-0,8

 

21,0 mm

15-ply

+ 0,8/-1,0

 

+ 1,4/-0,9

1,5

24,0 mm

17-ply

+ 0,9/-1,1

 

+ 1,5/-1,0

 

27,0 mm

19-ply

+ 1,0/-1,2

1,0

+ 1,6/-1,1

2,0

30,0 mm

21-ply

+ 1,1/-1,3

 

+ 1,7/-1,2

 

 

Note : Production of plywood is allowed in other thickness and construction (number of plies) corresponding with the terms of a contract. The minimum and maximum variances may be determined by the following formula.

 


Sanded Plywood - maximum/minimum tolerance:

 

  • Maximum: Thick * 0.03 mm + 0.2 mm (12 mm*0.03 mm + 0.2 mm) = 12 mm + 0.5 mm
  • Minimum: Thick * 0.03 mm + 0.4 mm (12 mm*0.03 mm + 0.4 mm) = 12 mm - 0.7mm


Unsanded Plywood - maximum/minimum tolerance:

 

  • Maximum: Thick * 0.03 mm + 0.8 mm (12 mm*0.03 mm + 0.8 mm) = 12 mm + 1.1mm
  • Minimum: Thick * 0.03 mm + 0.4 mm (12 mm*0.03 mm + 0.3 mm) = 12 mm - 0.6mm

     


3.2.2. Plywood panels must be cut at a right angle. Deviation must not exceed 2mm per 1 lineal meter.


3.2.3. Deviation from square edges can not exceed 2mm per 1 lineal meter.


3.3. Making if plywood must include:
— Name of product
— Woos species of the face and core veneers
— Glue Bond marks
— Veneer grades for face and core
— Formaldehyde emission classification
— Type of surface treatment
— Dimensions
— Applicable GOST standard
Below is an example of markings in plywood. Birch plywood with core plies of birch veneer, water resistant, with a combination of face and core veneers I/III, with an emission class of E1, sanded in both sides, in 2440 mm long, 1220 mm wide and 9mm thick is marked:
Birch plywood/birch, FK, I/III, E1, S2, 2440*1220*9 GOST 3916.1-96

 


4.Technical requirements


4.1. Characteristics


4.1.1. To produce face veneers for plywood, the following species can be used for the face veneer: birch, alder, maple, elm, beech, asp, poplar, lime. For core veneers, in addition to the ones just mentioned, the following can be used: pine, spruce, fir, larch and cedar.
The timber used to make veneers fir plywood determines the species of the plywood.
The plywood can be made of one or more than one species of wood, therefore it is either "homogeneous" or "combined".
If the number of veneer plies is even, the direction of fibers (grain) of the two middle plies must be parallel.
Veneers, located symmetrically within the thickness of plywood, must be the same species and thickness.
The thickness of the veneer used for the faces must not exceed 3,5 mm. And for the thickness if core veneers must nit exceed 4 mm.


4.1.2. Wood and manufacturing defects exceeding limits stated in Table 3, are not allowed in face veneers.


4.1.3. Wood and manufacturing defects, exceeding the limits stated in Table 3, are allowed in core veneers, as long as they do not influence its integrity and dimensions. The requirements for quality and dimensions are specified in this standard.


4.1.4. The maximum amount of wood and manufacturing defects allowed in face veneers is indicated in Table 4.


4.1.5. The combination of face veneer grades is indicated in GOST 30427.


4.1.6. The face veneer of E grade can consist of 2 components with one splice joint in the middle of the panel. This applies only to widths up to 1525 mm.
If the width is over 1525 mm, the face veneer if E grade can consist of 3 components of equal width. The face veneer of I and II grades can be made from an unlimited number of veneer components.
For grades E, I, II veneer joints must be parallel to plywood edges. Veneers must be matched for color.


4.1.7. Plugs must be even with the surface, firmly bonded, must match the color of the face of the panel. The grain must also be parallel to the direction of the wood fibers (grain) on face veneer. For grades I and II the plugs must match the color of the wood.

Putty fills or reapirs must match the color of the wood of a given grade. In addition, they must provide easy gluing, retain its color during plywood treatment and not crack while bending.


4.2. Strength and mechanical indices are stated in Table 5.


4.3. Formaldehyde content in plywood, depending in emission class, must meet the limits stated in Table 6.


4.4. The plywood is measured in either square meters or cubic meters. The volume of one panel is determined with a precision of up to 0.00001 m3. The volume of a few panels is determined with the precision of up to 0.5 m3. The squareness of a panel is measured with the precision of up to 0.01 m2. The squareness of a few panels in measured with a precision of up to 0.5 m2.


4.5. The marking is stamped with indelible paint on the back side of every panel stating plywood grade and inspector's number.
Marks of bundles or crates of plywood contain:
— Name if the country plywood-producer
— Name of mill-producer or its trade mark
— Conventional plywood marking
— Number of panels in the bundle
— National mark of conformity for certified production
— Transportation marking is in accordance with GOST 14192.


4.6. Packaging.


4.6.1. Plywood must be packed in bundles weighting no more than 1500 kgs. It has to be separated according to species, glue bond, grades, glue emission classes, types of surface treatments and dimensions.
If parties mutually agree and in accordance with a sales contract, plywood can be packed in bundles or other weights.


4.6.2. If plywood id to be shipped to regions in the Extreme North or other difficultto-reach regions, it has to be packed according to 4.6.1. and GOST 15848.

 


5. Rules of acceptance


5.1. Plywood is accepted in lots.
A lot consists of plywood of one species, one glue bond, one sort, one glue emission class one type of surface treatment and panel dimensions.

There should be one document for each lot, specifying quality and containing:
— Name of the country-producer
— Name of the mill-producer and (or) its trade mark
— Conventional plywood marking
— Volume or square meters of panels in lot
— Stamp of technical control
— National mark of conformity for a certified production


5.2. Quality and dimensions of panels are subject to random inspection. If specified in a sales contract (agreement), specific lots may be subject to full inspection. In a random inspection, sheets are selected indiscriminately in accordance with GOST 18324 and confirming the quantities, mentioned in Table 7.


5.3. Shear, tensile and static bending strengths are checked fir plywood of every species, glue bond and number of plies at least once month. In accordance with sales contracts (agreements), it is permitted to select 0.1 % of sheets in every lot, but not less than one sheet.


5.4. Formaldehyde emission is checked every 30 days for FSF plywood mark and every 15 days for FK plywood mark. In accordance with terms of sales contract, a check may be done every 7 days.


5.5. A lot is considered to meet the requirement of the current standard and is accepted, if in the random inspection the following is confirmed:
— number of plywood sheets which are not meeting the requirements of the current standard due to dimensions, out of square, linear edges, wood and manufacturing defects is LESS or EQUAL to the accepted amount, which is stated in Table 7.
— all sheets of plywood must have no bubbles, no delamination and no trace of bark — formaldehyde emission corresponds to the norms defined in Table 6.

 


6. Control methods


6.1. Selection of samples for strength and mechanical tests are done in accordance with GOST 9620. Selection of samples for formaldehyde emission tests are done in accordance with GOST 27678.


6.2. The length and width is measured at two points in the same panel, which are parallel to the edges and are located at least 100 mm from the edges. The measurements are done with a metal tape, which has an index error of 1 mm or less in accordance with GOST 7502. Measurements have to be taken twice and the actual length (width) of the sheet would be their average.


6.3. Thickness is measured at a distance of at least 100 mm from the edges.
Thickness also has to be measured at the middle of each side of the panel with a caliper as per GOST 11358, or with a micrometer with a scale division of at least 0.1 mm in accordance with GOST 6507.
Measurements of thickness have to be taken 4 times and the actual thickness would be an average of those 4 measurements.
The difference in thickness in one panel of plywood is determined as a difference between the maximum and minimum thickness from these 4 measurements.


6.4. Moisture content is determined in accordance with GOST 9621.


6.5. Shear strength along the glue line is determined in accordance with GOST
9624.


6.6. Static bending strength is determined in accordance with GOST 9625


6.7. Tensile strength is determined in accordance with GOST 9662


6.8. Formaldehyde emission is determined in accordance with GOST 27678


6.9. Roughness of the surface is determined in accordance with GOST 15612


6.10. Wood and manufacturing defects are measured in accordance with GOST 30427


6.11. Deviation from linear edges of plywood panel is determined by measurements of the maximum gap between the panel edge and metallic square edge in accordance with GOST 8925 and within an index error of 0,2 mm.


6.12. Measurements for squareness are determined in accordance with GOST 30427.

 


7. Transportation and storage


7.1. Plywood is transported in covered vehicles, in accordance with the transportation consignment rules for each given vehicle.


7.2. Transportation and storage of plywood, which is to be shipped to the Extreme North or difficult-to-access regions are done in accordance with GOST 15846.


7.3. Plywood is stored in horizontally stacked bundles, on pallets or on wooden pallets. The temperature of closed premises, in which the plywood is stored, should be between -400C to +50C. The humidity should not exceed 80%

 

 

8. Producers guarantee


Producers guarantee that the plywood conforms with the current GOST, as well as with transportation and storage conditions.
FK plywood has a guarantee of 3 years and FSF plywood has a guarantee of 5 years from the day it was shipped.

 


TABLE 3. Description and limitations of plywood defects

 

Description of deficts as per GOST 30427

E grade

plywood face veneers

I grade plywood face veneers

II grade plywood face veneers

II grade plywood face veneers

IV grade plywood face veneers

1.Pin knots

Not allowed

Max 3 per M2 allowed

Allowed

Allowed

Allowed

 

2.Sound lights and/or dark knots

 

 

Not allowed

Up to 5 per M2 max, 15mm diam. cracks no more than 0,5mm wide

Up to 10 per M2 max, 25mm diam. cracks no more than 1mm wide

 

Allow cracks not more than 1,5mm wide

 

Allow cracks not more than 1,5mm wide

3.Loose knots or with/without knot holes, worn holes in cluster or scattered

 

 

Not allowed

 

Up to 3 with max 6mm diam.

 

Up to 6 with max 6mm diam.

 

Up to 6 with max 6mm diam.

 

No limits with max 40 mm diam.

 

4.Tight cracks/splits

 

Not allowed

Up to 2 per 1M of plywood, max 200mm long

Up to 2 per 1M of plywood, max 200mm long

 

Allowed

 

Allowed

 

 

5.Wide cracks/splits

 

 

 

Not allowed

 

 

 

Not allowed

 

Up to 2 per 1M of plywood filled with putty max 200mm long

Up to 2 per 1M of plywood filled with putty max 600mm long and 5 mm wide

 

 

Allowed with limitations

6.Light Mold

Not allowed

Allowed

Allowed

Allowed

Allowed

 

 

7.Dark mold

 

 

Not allowed

 

 

Not allowed

General number allowed as per item 2 of present table

General number allowed as per item 2 of present table

 

 

Allowed

8.Deviation in wood structure

Allowed very insignificant,incidental disposition

Allowed

Allowed

Allowed

Allowed

 

9.Light color variation

 

Not allowed

Allowed, no more than 5% of the sheet surface

 

Allowed

 

Allowed

 

Allowed

10.Strong color variation

Not allowed

Not allowed

Not allowed

Not allowed

Allowed

11.Decay                 

Not allowed

Not allowed

Not allowed

Not allowed

Not allowed

 

 

12.Pinholes

 

 

Not allowed

General number allowed as per item 3 of present table

General number allowed as per item 3 of present table

General number allowed as per item 3 of present table

General number allowed as per item 3 of present table

 

 

13.Veneer overlap

 

 

 

Not allowed

 

 

 

Not allowed

Allowed no more than 100mm in quantity of no more than 1 piece for 1m of panel width

Allowed no more than 200mm in quantity of no more than 2 pieces for 1m of panel width

 

 

 

Allowed

14.Lack of veneer, defects of panel edges due to sanding or squaring

 

 

Not allowed

Allowed with a width of no more than 2mm

Allowed with a width of no more than 4mm

Allowed with a width of no more than 4mm

Allowed with a width of no more than 5mm

15.Presense of glue tape

 

Not allowed

 

Not allowed

Allowed in non-sanded plywood

Allowed in non-sanded plywood

Allowed in non-sanded plywood

 

16.Glue bleed through

 

Not allowed

 

Not allowed

Allowed no more than 2% of panel surface

Allowed no more than 5% of panel surface

 

Allowed

17.Scratches             

Not allowed

Not allowed

Allowed

Allowed

Allowed

 

18.Indentations or imprints

 

 

Not allowed

 

 

Not allowed

Allowed if depth/height is in range of thickness variance

Allowed if depth/height is in range of thickness variance

 

 

Allowed

 

19.Torn Grain, Brashy Fibers

 

Not allowed

 

Not allowed

Allowed no more than 5% of panel surface

Allowed no more than 15% of panel surface

 

Allowed

20.Grinding

Not allowed

Not allowed

Not allowed

Not allowed

Allowed

 

21.Warp and twist

Does not apply to thickness under 6,5mm. If over 6,5mm then allowed with sag of no more than 15mm over 1M panel's diagonal length

Does not apply to thickness under 6,5mm. If over 6,5mm then allowed with sag of no more than 15mm over 1M panel's diagonal length

Does not apply to thickness under 6,5mm. If over 6,5mm then allowed with sag of no more than 15mm over 1M panel's diagonal length

Does not apply to thickness under 6,5mm. If over 6,5mm then allowed with sag of no more than 15mm over 1M panel's diagonal length

Does not apply to thickness under 6,5mm. If over 6,5mm then allowed with sag of no more than 15mm over 1M panel's diagonal length

22.Metal inclusions

 

Not allowed

 

Not allowed

 

Not allowed

Color metal staples are allowed

Color metal staples are allowed

 

 

23.Gap in slice joint

 

 

Not allowed

 

 

Not allowed

Allowed with width of no more than 1mm in 1 piece for 1M of panel sheet

Allowed with width of no more than 2 mm in 1 piece for 1M of panel sheet

 

 

Allowed

24.Delamination, bubbles, etc

Not allowed

Not allowed

Not allowed

Not allowed

Not allowed

25.Waviness(for sanded plywood), charter marks

 

Not allowed

 

Not allowed

 

Not allowed

 

Allowed

 

Allowed

 

 

 

26.Rough or torn grain

 

Roughness parameter(Rm) is per GOST 7016; 100 for

sanded plywood and 200 for non-sanded

Roughness parameter(Rm) is per GOST 7016; 100 for

sanded plywood and 200 for non- sanded

Roughness parameter(Rm) is per GOST 7016; 100 for

sanded plywood and 200 for non- sanded

Roughness parameter(Rm) is per GOST 7016; 100 for

sanded plywood and 200 for non- sanded

Roughness parameter(Rm) is per GOST 7016; 100 for

sanded plywood and 200 for non- sanded

 

27.Wooden plugs

 

Not allowed

 

Not allowed

Allowed in repair up to 8 pieces for 1m2 of panel

 

Allowed with no limits

 

Allowed with no limits

 

28.Overlapped plugs

 

Not allowed

 

Not allowed

Allowed no more than 2 pieces per 1m2 of panel

 

Allowed

 

Allowed

 

Note:
1. Norm of manufacturing defects "lack of veneer" refers both to outer and core lines.
2. Wood and manufacturing defects which are not mentioned in Table 3 are not allowed.

 


TABLE 4

 

Grade of Face Veneer

Maximum amount of permitted defects for wood and manufacturing (in pieces)

E

No visible defects

I

3

II

6

III

9

IV

Amount of wood and manufacturing defects is unlimited. Limits on dimensions is in accordance with items 3,5,11,12,14,24 of Table 3

 

APPENDIX A
COMPARATIVE CHART OF GRADE MARKING IN THIS GOST, IN GOST 10.55-71
AND GOST 3916.1-89
GRADES

 

GOST 3916.1-96

GOST 10.55-71

GOST 3916.1-89

E

-

A

I

B

AB

II

BB

B

III

CP

BB

IV

C

C

 

 

TABLE 5

 

 

Index

 

Thickness(mm)

Glue bond

 

Birch

Alder Beech

Pine Larch Fir Silverfir Cedar

Lime Asp Poplar

Moisure content

3-30

FSF FK

5-10

5-10

5-10

5-10

Shear strenght (MPa) not less than

after boiling in water for 1 hour

 

 

3-30

FSF

1,5

1,2

1,0

0,6

after soaking in water for 24 hours

FK

1,5

1,0

1,0

0,6

Static bending strength of fibres (MPa) not less than

 

9-30

FSF

60

50

40

30

FK

55,0

45,0

35,0

25,0

Tensile strengh

3-6,5

FSF

40,0

40,0

40,0

40,0

along fibers, MPa, no less than

 

FK

30,0

30,0

30,0

30,0

 

Note: Shear strength along glue line of 1.2. Mpa is permitted in accordance with terms of a sales contract.

 


TABLE 6

 

Glue Emission Class

Formaldehyde content in 100 grams of dry plywood mass, in mg.

E1

Up to 10

E2

From 10 to 30

 

 

TABLE 7

 

 

Volume for the lot

Index of control on the items below(in panels)

3.2.1.; 3.2.3; 3.2.3; 4.1.2; 4.1.6; 4.1.7; 4.3

Selection Volume

Number for Acceptance

Selection Volume

Number for Acceptance

Up to 500

8

1

13

1

501 to 1200

13

1

20

2

1201 to 3200

13

1

32

3

3201 to 10000

20

2

32

 

 

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