1. Glued plywood of marks ФК and ФСФ according to GOST 3916.1-96 with the combination of grades of exterior layers I, II, III, IV Mark As for the water resistance of plywood glued connection it is divided into: ФСФ – plywood with higher water resistance ФК – waterproof plywood Grade Depending on the appearance of exterior layers plywood is subdivided into five grades: E (elite), I, II, III, IV. The grade of plywood is designated by a combination of grades of the exterior and turnaround layers: a grade of an exterior layer/ a grade of a turnaround layer, for example, E/I, I/I/, II/II, II/III, II/IV, III/III, III/IV, IV/IV. | | Grade I – pin knots up to 3 pieces, live knots up to 15 mm, dropping out knots up to 6 mm are permitted, close cracks are permitted no more than 200 mm in quantity of 2 pieces on 1 m of width, healthy change of stain is permitted no more than 5 %, other defects of wood are excluded. | | | Grade II – pin knots, live knots up to 25 mm which drop out up to 6 mm, close cracks and started cracks 2mm in quantity of 2 pieces by length up to 200 mm, healthy changes of stain and wooden inserts are permitted. |
| | Grade III – live knots, dropping out knots up to 6 mm, close cracks and started cracks of 2 mm in quantity of 2 pieces by length up to 300 mm, healthy changes of stain , wooden inserts, sinuosity and ripples. | | | Grade IV – dropping out knots up to 40 mm without restriction of quantity are permitted, started cracks in width no more than 10 mm without restriction, wooden inserts, sinuosity and ripples. | |
Thickness
| Nominal plywood thickness (mm).
| Number of layers, not less than (pcs.). | Polished plywood. | Not polished plywood. | | Maximum deviation in thickness ( + mm). | Average polythickness ( + mm). | Maximum deviation in thickness ( + mm). | Average polythickness ( + mm). | | 1 | 2 | 3 | 4 | 5 | 6 | | 3 | 3 | 0,3 | 0,6 | 0,4 | 0,6 | | -0,4 | -0,3 | | 4 | 3 | 0,3 | 0,8 | 1 | | -0,5 | -0,4 | | 5 | 4, 5 | 0,4 | 0,9 | | -0,6 | -0,4 | | 6 | 5 | 0,4 | 1 | | -0,6 | -0,5 | | 8 | 7 | 0,4 | 1 | | -0,6 | -0,5 | | 9 | 7 | 0,4 | 1 | | -0,6 | -0,5 | | 10 | 7, 9 | 0,5 | 1,1 | | -0,7 | -0,6 | | 11 | 7, 9 | 0,5 | 1,1 | | -0,7 | -0,6 | | 12 | 9 | 0,5 | 1,1 | | -0,7 | -0,6 | | 15 | 11 | 0,6 | 1,2 | 1,5 | | -0,8 | -0,7 | | 18 | 13 | 0,7 | 1,3 | | -0,9 | -0,8 | | 20 | 15, 17 | 0,8 | 1,4 | | -1,0 | -0,9 | | 21 | 15 | 0,8 | 1,4 | | -1,0 | -0,9 | Size 1. We produce plywood of the following size: 1525x1525 mm, 1475x1525 mm, 1525x1475 mm, 1475x1475 mm, 1220x1525 mm, 1220x1220 mm. 2. Birch plywood according to ТУ 5512-004-00273235 with the combination of grades of the exterior layers (shirt) I, II, III, IV. 3. A pencil (waste of peeling): diameter – 72 mm, length – 1630 mm. 4. Fence (product out of pencil): thickness – 34 mm, length – 1630 mm. 5. A plywood lining (waste product from cutting): length – 462 mm, width – 120 mm, thickness – 3 mm. 6. Birch sawdust. |