| 1. Pin knots | Allowed | Allowed | Allowed | Allowed | Allowed | Allowed | Allowed | Allowed | Allowed | Allowed | Allowed |
| 2. Knots: sound, intergrown, light and dark | Not allowed | ‑ | Up to 15 mm diameter, shake ≤0.5 mm wide, 5 pcs/m² | Up to 15 mm diameter, shake ≤0.5 mm wide, 5 pcs/m² | 10 pcs/m² | Up to 25 mm diameter, shake ≤1 mm wide | Shake ≤1 mm wide | ‑ | Allowed | ‑ | ‑ |
| 3. Partially intergrown knots | Size & quantity comply with Item 4 | ‑ | ‑ | ‑ | Within total intergrown‑knot limit: Ø≤15 mm, 10 pcs/m² | ‑ | ‑ | ‑ | ‑ | Up to 40 mm diameter, no quantity limit | Up to 70 mm diameter, no quantity limit |
| 4. Black knots, loose knots, knot holes (no bark inclusions) | ‑ | Ø≤6 mm, 2 pcs/m² | Within intergrown‑knot total: Ø≤6 mm, 3 pcs/m² | ‑ | ‑ | ‑ | Ø≤6 mm, no quantity limit | ‑ | Ø≤15 mm,7 pcs/m² | Ø≤40 mm, no quantity limit; bark patches ≤5 mm around knots permitted | Ø≤70 mm, no quantity limit; bark patches ≤5 mm around knots permitted |
| 5. Close shakes | ≤200 mm long, 2 pcs/m of sheet width | ‑ | ≤200 mm long,5 pcs/m of sheet width | ‑ | ≤300 mm long,5 pcs/m of sheet width | ‑ | Marginal & medial permitted | ‑ | ‑ | ‑ | ‑ |
| 6. Open shakes, open splits in spliced veneer | Not allowed | ≤200 mm long, ≤1 mm wide,2 pcs/m sheet width | Not allowed | ≤200 mm long, ≤1 mm wide,2 pcs/m sheet width | ≤200 mm long, ≤2 mm wide,3 pcs/m sheet width | ≤250 mm long, ≤2 mm wide,3 pcs/m sheet width | ≤600 mm long, ≤2 mm wide,2 pcs/m sheet width; up to 600 mm ×5 mm if putty‑sealed | Same as CP | ≤600 mm long, ≤5 mm wide,2 pcs/m sheet width | ≤800 mm long, ≤10 mm wide, no quantity limit | ≤15 mm wide, no quantity limit |
| 7. Timber structure flaws (diagonal grain, swirly grain, burls, bud traces) | Allowed, dark bud traces excluded | ‑ | ‑ | ‑ | ‑ | Allowed | ‑ | ‑ | ‑ | ‑ | ‑ |
| 8. Flaws in wood (inner inbark, light and dark) | Light inbark permitted; dark inbark follows black‑knot limits | ‑ | ‑ | ‑ | ‑ | ‑ | ‑ | ‑ | ‑ | ‑ | ‑ |
| 9. Flaws in wood (open inbarks) | Allowed within black‑knot total limits | ‑ | ‑ | ‑ | ‑ | ‑ | ‑ | ‑ | ‑ | ‑ | ‑ |
| 10. Sound discoloration (false heartwood) | Not allowed | ‑ | ‑ | ‑ | Up to 25 % of sheet surface | ‑ | Up to 75 % of sheet surface | ‑ | ‑ | ‑ | Allowed |
| 11. Sound discoloration (streaks, streak traces) | ≤100 mm ×2 mm,3 pcs/m² | ≤175 mm ×2 mm,3 pcs/m² | Light: ≤175 mm ×4 mm,3 pcs/m² | Light: ≤175 mm ×4 mm,5 pcs/m² | 10 pcs/m² | ≤250 mm ×10 mm, 2 pcs/m² | ‑ | ‑ | Allowed | ‑ | ‑ |
| 12. Sound discoloration (congested streaks) | Not allowed | Light‑colored ≤30×30 mm, 1 pcs/m² | ‑ | ‑ | ≤60×40 mm, 1 pcs/m² | ‑ | Allowed | ‑ | ‑ | ‑ | ‑ |
| 13. Mineral streaks, sap stains (blue, colored sap stains), wood discoloration during storage | Not allowed | Up to 5 % sheet area | Up to 30 % sheet area | ‑ | ‑ | Up to 50 % sheet area (combined with false heartwood) | ‑ | Up to 75 % sheet area (combined with false heartwood) | ‑ | ‑ | Allowed |
| 14. Biological damage (wormholes) | ‑ | ‑ | ‑ | ‑ | Within black‑knot total limits | ‑ | ‑ | ‑ | ‑ | ‑ | ‑ |
| 15. Discoloration with partial wood damage | Not allowed | Separate stripes ≤30 mm wide ×200 mm long, 2 pcs/m sheet length | ‑ | ‑ | ‑ | ‑ | ‑ | ‑ | ‑ | ‑ | ‑ |
| 16. Knotting and patching with wooden inserts | Not allowed | 1 pcs/m² | Not allowed | Up to 1 pcs/m² | Not allowed | Up to 8 pcs/m² | Gap ≤1 mm on one side (or ≤0.5 mm both sides) | Same as CP | Allowed | ‑ | ‑ |
| 17. Double patch | ‑ | ‑ | Not allowed | ‑ | ‑ | Up to 1 pcs/m² | ‑ | Allowed | ‑ | ‑ | ‑ |
| 18. Shake filling | ‑ | Not allowed | ‑ | ‑ | ‑ | Shakes >2 mm must be filled with glued veneer patches | Shakes >5 mm must be filled with glued veneer patches | Shakes >5 mm must be filled with glued veneer patches | ‑ | Allowed | ‑ |
| 19. Overlap ridges (telegraphing overlaps) | Not allowed | ‑ | ‑ | ‑ | ≤200 mm ×10 mm,3 pcs/sheet | ‑ | ≤600 mm ×10 mm,5 pcs/sheet | ‑ | ≤10 mm width | Allowed | ‑ |
| 20. Overlap | Not allowed | ‑ | ‑ | ‑ | ≤100 mm ×2 mm,1 pcs/m sheet width | ‑ | ≤300 mm ×2 mm,2 pcs/m sheet width | ‑ | ≤600 mm ×4 mm,2 pcs/m sheet width | Allowed | ‑ |
| 21. Manufacturing stains (beam traces, lines) | ‑ | Not allowed | ‑ | ‑ | Up to 10 % sheets per bundle | ‑ | ‑ | Allowed | ‑ | ‑ | ‑ |
| 22. Glue stain | ‑ | Not allowed | ‑ | Up to 1 % sheet area | ‑ | 3‑21 mm: ≤2 % sheet area; ≥24 mm: ≤5 % sheet area | 3‑21 mm: ≤5 % sheet area; ≥24 mm: ≤10 % sheet area | ‑ | 3‑21 mm: ≤5 % sheet area; ≥24 mm: ≤10 % sheet area | Allowed | ‑ |
| 23. Mechanical defects (pinholes, saw cuts) | ‑ | ‑ | ‑ | ‑ | ‑ | Within black‑knot total limits | ‑ | ‑ | ‑ | ‑ | ‑ |
| 24. Scratches, grooves, pimples, ridges | ‑ | Not allowed | ‑ | ‑ | ‑ | ‑ | Depth ≤0.5 mm; ≤120 mm ×10 mm | Same as CP | ≤120 mm long | Allowed | ‑ |
| 25. Warping | Ignored ≤6.5 mm thickness; >6.5 mm: ≤10 mm/m of sheet diagonal | Ignored ≤6.5 mm thickness; >6.5 mm: ≤15 mm/m of sheet diagonal | ‑ | ‑ | ‑ | ‑ | ‑ | ‑ | ‑ | ‑ | ‑ |
| 26. Adhesive thread occurrence | ‑ | Not allowed | ‑ | ‑ | ‑ | ‑ | Allowed | ‑ | ‑ | ‑ | ‑ |
| 27. Blisters, delamination, bark patches | ‑ | ‑ | ‑ | ‑ | ‑ | Not allowed | ‑ | ‑ | ‑ | ‑ | ‑ |
| 28. Sander skips (uneven sanding) | ‑ | Not allowed | ‑ | ‑ | Up to 5 mm from edge | ‑ | ‑ | Up to 5 % sheet area | ‑ | Up to 50 % sheet area | Allowed |
| 29. Face veneer oversanding | Not allowed | ‑ | ‑ | ‑ | ‑ | ‑ | 3‑21 mm: ≤1 % sheet area; ≥24 mm: ≤2 % sheet area | ‑ | ‑ | ‑ | ‑ |
| 30. Metal inclusions | ‑ | ‑ | Not allowed | ‑ | Non‑ferrous metal staples allowed | ‑ | ‑ | ‑ | ‑ | ‑ | ‑ |
| 31. Edge defects caused by sanding, cutting (fringe), veneer shortage | ‑ | Not allowed | ‑ | ‑ | ‑ | ‑ | Up to 5 mm wide along edge | ‑ | ‑ | Up to 10 mm wide | Up to 25 mm wide |
| 32. Coarse peeling | ‑ | Not allowed | ‑ | ‑ | Up to 5 % sheet surface | ‑ | Up to 15 % sheet surface | ‑ | ‑ | Allowed | ‑ |
| 33. Waviness (sanded plywood), rough saw cut, ripple | ‑ | ‑ | Not allowed | ‑ | ‑ | ‑ | ‑ | ‑ | Allowed | ‑ | ‑ |
| 34. Rough surface | Rm max:100 µm (sanded), 200 µm (unsanded), GOST 7016 | ‑ | ‑ | ‑ | ‑ | ‑ | ‑ | ‑ | ‑ | ‑ | ‑ |
| 35. Pockets (without bark inclusions) | ‑ | Not allowed | ‑ | ‑ | ‑ | Within congested‑streak size (60×40 mm),2 pcs/m² | Allowed | ‑ | ‑ | ‑ | ‑ |
| 36. Pasted veneer chips | ‑ | Not allowed | ‑ | ‑ |
