Baltic Russia Birch plywood grading rules and standards Grade C

Baltic Russia Birch plywood grading rules and standards Grade C

http://www.sgknordic.com/en/catalog/view_birch_plywood/

Category of defects
Amount of allowed defects
Sound intergrown knots light color only
Allowed
Other knots and knot holes
Allowed up to an individual maximum diameter of 40mm
Repaired defects ( inserts)
Allowed
Double inserts
Allowed
Close splits
Allowed
Open splits
Allowed for an individual max. width up to 10mm
Irregularities in the structure of the wood
Allowed
Hearth and discoloration
Allowed
Defects at the edges due to sanding or sawing
Allowed up to 5 mm from the edge
Glue penetration
Allowed
Sanding trough
Allowed
Inner plies veneer overlapping
Allowed
Hollows, bumps, imprints, roughness
Allowed

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