Baltic Russia Birch plywood grading rules and standards Grade B

Baltic Russia Birch plywood grading rules and standards Grade B

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

Category of defects
Amount of allowed defects
Pin knots light
Allowed , not more than 3 per m2
Sound intergrown knots light color only Permitted
Allowed up to an individual maximum diameter of 15mm with total quantity not more than 5 per m2
Any dark knots
Not allowed
Knots and knotholes repairement
Not allowed
Close splits
Allowed for an individual maximum length up to 100mm and in number up to 1 per one panel’s running meter.
Open splits
Not allowed
Irregularities in the structure of the wood
Hearth and discoloration
Not allowed
Defects at the edges due to sanding or sawing
Not allowed
Glue penetration
Not allowed
Sanding trough
Not allowed
Inner plies veneer overlapping
Not allowed

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