Baltic Russia Birch plywood grading rules and standards Grade CP

Baltic Russia Birch plywood grading rules and standards Grade CP

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 6mm with total quantity not more than 6 per m2. Total number of knots should not exceed 10 per m2
Repaired defects ( inserts)
Allowed
Double inserts
Allowed
Close splits
Allowed
Open splits
Allowed for an individual max. length up to 600mm and width up to 5mm in number up to 5 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 4 mm from the edge
Glue penetration
Allowed up to 5% of surface
Sanding trough
Not allowed
Inner plies veneer overlapping
Allowed for an individual max length up to 200mm, in number max.2 per one panel’s running meter
Hollows, bumps, imprints, roughness
Allowed, but slight within the panels thickness tolerance

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