Baltic Russia Birch plywood grading rules and standards Part 1

Baltic Russia Birch plywood grading rules and standards

http://www.sgknordic.com/en/catalog/view_birch_plywood/

  • Grades : B, S,BBx ( extra), BB, CP, WG, C, Shop
  • Sizes,mm: 1525×1525, 2440×1220,2500×1250,1525×2440,1500×3000, 1525×3050
  • Ulltimate shear strength along the glue line-not less than 2.0 mPa
  • Ultimate static bending strength along the fiber on the outer veneer ( thickness of sheets from 9 to 30mm)- not less than 60 mPa
  • Ultimate tensile strength along the fiber (thickness of sheets from 3 to 6.5mm) – not less than 30mPa.
  • Moisture content- 5-10%
Standard thickness,mm
Number of plies
             Sanded plywood
             Not sanded plywood
Ultimate thickness tolerance,mm
Thickness variance,mm
Ultimate thickness tolerance,mm
Thickness variance,mm
3
3
+- 0.3
0.6
+0.4/-0.3
0.6
4
3
+- 0.3
0.6
+0.8/-0.4
1.0
6,7
5
+- 0.4
0.6
+0.9/-0.4
1.0
8,9
7
+- 0.4
0.6
+1.0/-0.5
1.0
10,11,12
9
+- 0.5
0.6
+1.1/-0.5
1.0
15
11
+-0.7
0.6
+1.2/-0.7
1.5
18
13
+-0.7
0.6
+1.3/-0.8
1.5
21
15
+-0.8
0.6
+1.4/-0.9
1.5
24
17
+-0.9
0.6
+1.5/-1.0
1.5
27
19
+1.0/-1.2
1.0
+1.6/-1.1
2.0
30
21
+1.1/-1.3
1.0
+1.7/-1.2
2.0
35
23
+1.3/-1.5
1.2
+1.9/-1.4
2.5
40
31
+1.4/-1.6
1.2
+2.0/-1.5
2.5
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