Baltic Russia Birch plywood grading rules and standards Grade WG

Baltic Russia Birch plywood grading rules and standards Grade WG

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 15mm with total quantity not more than 10 per m2.
Repaired defects ( inserts)
Allowed
Double inserts
Allowed
Close splits
Allowed
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
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 up to 5% of surface
Sanding trough
Allowed
Inner plies veneer overlapping
Allowed
Hollows, bumps, imprints, roughness
Allowed, but slight within the panels thickness tolerance
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