Baltic Russia Birch plywood grading rules and standards Grade S

Baltic Russia Birch plywood grading rules and standards Grade S

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 20mm with total quantity not more than 2.5 per 1 m2
Any dark knots
Allowed up to an individual maximum diameter of 10mm not more than 2.5mm per 1m2
Knots and knotholes repairement
Allowed up to an individual not more per 1m2
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 1 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 5 mm from the edge
Glue penetration
Not allowed
Sanding trough
Not allowed
Inner plies veneer overlapping
Allowed in number up to 2 per 1m2
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