Russian plywood grading rules in accordance with GOST 10.55-71 and GOST 3916.1-96

Russian plywood grading rules in accordance with GOST 10.55-71 and GOST 3916.1-96

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Simplified Russian plywood grading rules in accordance with GOST 10.55-71 and GOST 3916.1-96 are presented below:

Grade CP

10.55-71 Grade B Grade BB Grade CP Grade C
3916.1-96 Grade I Grade II Grade III Grade IV
Pin knots Not more than 3 per square meter Allowed Allowed Allowed
Sound intergrown knots Allowed with diameter not more than 15 mm Allowed with diameter not more than 25 Allowed with cracks not wider than 1,5 mm Allowed
Other knots Allowed with maximum diameter 6 mm Allowed with maximum diameter 6 mm Allowed with maximum diameter 6 mm Allowed with maximum diameter 40 mm
Closed splits Maximum length 200 mm Maximum length 200 mm Allowed Allowed
Open splits Not allowed Allowed with maximum size 200*2 mm Allowed with maximum size 300*2 mm Allowed with maximum width 10 mm
Light discoloration Allowed not more than 5% of the surface Allowed Allowed Allowed
Heavy discoloration Not allowed Not allowed Not allowed Allowed
Glue penetration (through faces) Not allowed Allowed not more than 2% of the surface of the panel Allowed not more than 5% of the surface of the panel Allowed
Veneer overlapping Not allowed Allowed with maximum length 100 mm Allowed with maximum length 200 mm Allowed
Repairing by plugs Not allowed Allowed with single plugs Allowed with double plugs Allowed with double plugs
Sanding through faces Not allowed Not allowed Not allowed Allowed
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