1. Pin knots up to 3 mm in diameter. GRADE:B - Allowed. 2. Healthy knots intergrown light GRADE:B - Allowed not more than 10 mm in size in an amount of not more than 2 pieces per 1 m2 of sheet surface. 3. Knots. healthy. intergrown. dark GRADE:B - Allowed not more than 6 mm in size in an amount of not more than 2 pieces per 1 m2 of sheet surface. 4. The knots are partially accrete and not accrete. Holes from dropped knots. wormhole GRADE:B - Not allowed. 5. Cracks closed GRADE:B - Allowed no more than 200 mm long in an amount of no more than 2 pcs per 1 m of sheet width. 6. Cracks are open GRADE:B - Not allowed. 7. Healthy discoloration: blotchiness. blueness. streaks GRADE:B - No more than 10% of the sheet surface is allowed. 8. Healthy discoloration: false nucleus. chemical stains. GRADE:B - Not allowed. 9. Wood inserts GRADE:B - Not allowed. 10. Double wood insert. GRADE:B - Not allowed. 11. Covering knots and cracks. cracks in the outer layers GRADE:B - Not allowed. 12.the veneer in the outer layers GRADE:B - Not allowed. 13. Dents on the veneer in the outer layers GRADE:B - Not allowed. 14. Lack of veneer in inner layers GRADE:B - Not allowed. 15. Lack of veneer at the edges GRADE:B - Not allowed. 16. Edge defects during sanding and trimming. GRADE:B - Not allowed. 17. Warpness GRADE:B - Allowed with an arrow of a deflection of not more than 15 mm per 1 m of the diagonal length. 18. Leakage of glue GRADE:B - Not allowed. 19. Surface roughness GRADE:B - The roughness parameter Rm. ?m according to GOST 7016 should be: for sanded plywood - no more than 100 ?m. for unpolished - no more than 200 ?m. 20. Ribbonding GRADE:B - Not allowed. 21. Rowling on veneer GRADE:B - Not allowed.