Name of wood defects and processing defects according to GOST 30427
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Name of wood defects and processing defects according to GOST 30427 |
Plywood with outer layers of veneer grades |
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| B | BB | CP | C | |
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Not taken into account by size, mm, no more |
Allowed with cracks no more than 1.5 mm wide |
Allowed |
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Light 10 |
Light and dark 10 |
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| allowed size, mm, no more | ||||
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Light 25 |
Light and dark 25 |
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quantity per 1 m², pcs., no more |
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| 5 | 10 | |||
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Allowed among fused knots with a diameter, mm, no more |
Allowed |
Allowed |
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5 |
15 |
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| quantity, pcs, no more | ||||
| 3 | 10 | |||
| per 1 m² of sheet surface | ||||
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c) falling out unfused knots and holes from fallen knots, wormhole |
Allowed in the total number of fused knots size, mm, no more |
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5 |
6 |
6 |
40 |
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| quantity per 1 m² of sheet surface, pcs, no more | ||||
| 3 | 3 | without limitation | 10 | |
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Not allowed |
Allowed in the total number of fused knots size, mm, no more |
Allowed size, mm, no more |
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6 |
6 |
40 |
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| Quantity, not more | ||||
| 3 | 3 | 10 | ||
| per 1 m² of sheet surface | ||||
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Not allowed |
Allowed in total with the norms of point 1a of this table |
Allowed without restrictions on size and quantity |
Allowed in the total number of unfused knots of the size and quantity specified in point 1c |
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Edge length allowed, mm, no more |
Edge and middle are allowed |
Edge and middle are allowed |
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| Quantity, not more | ||||
| 5 | 10 | |||
| per 1 m sheet width | ||||
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Not allowed |
Among closed cracks, edge cracks are allowed, width, mm, no more |
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2 |
2 |
10 |
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| Length, mm , not more | ||||
| 250 | 600 | 400 | ||
| quantity, pcs, no more | ||||
| 3 | Without limitation | 5 | ||
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per 1m sheet width |
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5. Deviations in the structure of wood: inclination of fibers, curling, curl, eyes |
Allowed |
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6. Healthy Discoloration: |
Not allowed |
Allowed on the sheet surface, %, no more than 25 |
Allowed in the form of strips with a total area, %, no more than 75 |
Allowed |
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Allowed length, mm, no more |
Allowed |
Allowed |
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175 |
250 |
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| width, mm, no more | ||||
| 4 | 10 | |||
| no more than 3 pcs. per 1 m² of sheet surface | no quantity limit | |||
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Allowed size, mm, no more than 60x60 |
Allowed |
Allowed |
Allowed |
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Allowed on the sheet surface, %, no more |
Allowed |
Allowed |
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30 |
50 |
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Not allowed |
Allowed on the sheet surface is no more than 50% |
Allowed |
Allowed |
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The total surface area of the leaf with browning and false core should not exceed 50% |
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Not allowed |
Not allowed |
Not allowed |
Not allowed |
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10. Chemical stains |
Not allowed |
Not allowed |
Allowed |
Allowed |
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Not allowed |
Allowed length, mm, no more |
Allowed |
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100 |
200 |
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| quantity per 1 m of sheet width, pcs, no more | ||||
| 3 | 5 | |||
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Not allowed |
Not allowed |
Not allowed |
Allowed |
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Allowed, %, sheet area, no more |
Allowed |
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10 |
25 |
50 |
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Not allowed |
Allowed depth (height) no more than 0.5mm |
Allowed depth (height) no more than 0.5mm |
Allowed |
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15. Mechanical damage and processing defects: a) injections |
Allowed in the total number of unfused knots of the size and quantity specified in point 1c |
Allowed in the total number of unfused knots of the size and quantity specified in point 1c |
Allowed in size no more than 6mm without quantity limitation |
Not taken into account if the size is no more than 6 mm; those taken into account are allowed in the total number of unfused knots in the sizes and quantities |
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b) scratches |
Not allowed |
Not allowed |
Allowed |
Allowed |
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16. Warped |
In plywood up to 5 mm thick it is not taken into account, thickness over 5 mm is allowed with a deflection arrow no more than 15 mm per 1 m of plywood sheet diagonal length |
In plywood up to 5 mm thick it is not taken into account, thickness over 5 mm is allowed with a deflection arrow no more than 15 mm per 1 m of plywood sheet diagonal length |
In plywood up to 5 mm thick it is not taken into account, thickness over 5 mm is allowed with a deflection arrow no more than 15 mm per 1 m of plywood sheet diagonal length |
In plywood up to 5 mm thick it is not taken into account, thickness over 5 mm is allowed with a deflection arrow no more than 15 mm per 1 m of plywood sheet diagonal length |
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17. Edge-glued veneer |
Not allowed |
Not allowed |
Not allowed |
Not allowed |
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18. Delamination, bubbles, bark patch |
Not allowed |
Not allowed |
Not allowed |
Not allowed |
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19. Surface roughness |
Roughness parameter according to GOST 7016, microns, no more: for sanded plywood – 100, for unsanded plywood – 200 |
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Not allowed |
Allowed, total number of inserts and allowed healthy knots according to the norms of point 1a |
Allowed without quantity limitation, with a gap of 1 mm on one side or with a gap of 0.5 mm on both sides |
Veneer sheets are allowed without sealing knots and holes |
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Not allowed |
Not allowed |
Allowed |
Veneer sheets are allowed without sealing knots and holes |
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Not allowed |
Not allowed |
Not allowed |
No more than 2mm allowed |
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Allowed depth no more than 2mm |
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Notes: 1. Wood defects and processing defects not listed in this table are not allowed.