BALTIC BIRCH GRADE B
Outstanding Quality
WOOD FLAWS & PROCESSING DEFECTS
GRADE B
PIN KNOTS
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
DARK KNOTS
Not allowed
KNOTS AND KNOTHOLES REPAIRS
Not allowed
CLOSED SPLITS
Allowed up to an individual maximum length of 100mm and in number, up to 1 per one panel’s running meter
OPEN SPLITS
Not allowed
IRREGULARITIES IN STRUCTURE OF THE WOOD
Allowed
HEARTH AND DISCOLORATION
Not allowed
DEFECTS AT EDGES DUE TO SANDING OR SAWING
Not allowed
GLUE PENETRATION
Not allowed
SANDING TROUGH
Not allowed
INNER PLIES VENEER OVERLAPPING
Not allowed
BALTIC BIRCH GRADE BB
WOOD FLAWS & PROCESSING DEFECTS
GRADE BB
PIN KNOTS
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 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)
Not more than 8 pieces per 1 m2 of surface
DOUBLE INSERTS
Not allowed
CLOSED SPLITS
Allowed up to an individual maximum length of 200mm and in number, up to 2 per one panel’s running meter.
OPEN SPLITS
Allowed up to an individual maximum length of 200mm, maximum width of 2mm, and in number, up to 2 per one panel’s running meter
IRREGULARITIES IN STRUCTURE OF THE WOOD
Allowed
HEARTH AND DISCOLORATION
Allowed up to 30% of surface
DEFECTS AT EDGES DUE TO SANDING OR SAWING
Allowed up to 4mm from edge
GLUE PENETRATION
Allowed up to 2% of surface
SANDING TROUGH
Not allowed
INNER PLIES VENEER OVERLAPPING
Allowed up to an individual maximum length of 100mm and in number, up to 1 per one panel’s running meter
BALTIC BIRCH GRADE CP
WOOD FLAWS & PROCESSING DEFECTS
GRADE CP
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
CLOSED SPLITS
Allowed
OPEN SPLITS
Allowed up to an individual maximum length of 600mm, maximum width of 5mm, and in number, up to 5 per one panel’s running meter
IRREGULARITIES IN STRUCTURE OF THE WOOD
Allowed
HEARTH AND DISCOLORATION
Allowed
DEFECTS AT EDGES DUE TO SANDING OR SAWING
Allowed up to 4mm from edge
GLUE PENETRATION
Allowed up to 5% of surface
SANDING TROUGH
Allowed
INNER PLIES VENEER OVERLAPPING
Allowed up to an individual maximum length of 200mm and in number, up to 2 per one panel’s running meter
HOLLOWS, BUMPS, IMPRINTS, ROUGHNESS
Allowed, but slight, within the panel’s thickness tolerance
BALTIC BIRCH GRADE C
WOOD FLAWS & PROCESSING DEFECTS
GRADE C
SOUND INTERGROWN KNOTS LIGHT COLOR ONLY
Allowed
OTHER KNOTS AND KNOT HOLES
Allowed up to an individual maximum diameter of 40mm.
REPAIRED DEFECTS (INSERTS)
Allowed
DOUBLE INSERTS
Allowed
CLOSED SPLITS
Allowed
OPEN SPLITS
Allowed up to an individual maximum width of 10mm
IRREGULARITIES IN STRUCTURE OF THE WOOD
Allowed
HEARTH AND DISCOLORATION
Allowed
DEFECTS AT EDGES DUE TO SANDING OR SAWING
Allowed up to 5mm from edge
GLUE PENETRATION
Allowed
SANDING TROUGH
Allowed
INNER PLIES VENEER OVERLAPPING
Allowed
HOLLOWS, BUMPS, IMPRINTS, ROUGHNESS
Allowed