Baltic Russia Birch plywood grading rules and standards Grade WG

Baltic Russia Birch plywood grading rules and standards Grade WG

Category of defects
Amount of allowed defects
Sound intergrown knots light color only
Other knots and knot holes
Allowed up to an individual maximum diameter of 15mm with total quantity not more than 10 per m2.
Repaired defects ( inserts)
Double inserts
Close splits
Open splits
Allowed for an individual max. width up to 4mm with total quantity not more than 2 per one panel’s running meter.
Irregularities in the structure of the wood
Hearth and discoloration
Defects at the edges due to sanding or sawing
Allowed up to 5 mm from the edge
Glue penetration
Allowed up to 5% of surface
Sanding trough
Inner plies veneer overlapping
Hollows, bumps, imprints, roughness
Allowed, but slight within the panels thickness tolerance
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