Baltic Russia Birch plywood grading rules and standards Grade BB

Baltic Russia Birch plywood grading rules and standards Grade BB

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

Category of defects
Amount of allowed defects
Pin knots light
Allowed
Sound intergrown knots light color only Permitted
Allowed up to an individual maximum diameter of 25mm with total quantity not more than 10 per  m2
Other knots
Allowed up to an individual maximum diameter of 6mm with total quantity not more than 6 per m2
Knots and knotholes repairement
Not allowed
Close splits
 Allowed for an individual max. length up to 200mm and in number up to 2 per one panel’s running meter.
Open splits
Allowed for an individual max. length up to 200mm and width up to 2mm in number up to 2 per one panel’s running meter.
Irregularities in the structure of the wood
Allowed
Hearth and discoloration
Allowed, not more 20% of surface
Defects at the edges due to sanding or sawing
Allowed up to 4 mm from the edge
Glue penetration
Allowed up to 2% of surface
Sanding trough
Not allowed
Inner plies veneer overlapping
Not allowed

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