BB
Furniture Grade - Marketing BB


Categories of defects
Permissible amount of defects
Permitted
Sound intergrown knots
Permitted up to an individual maximum diameter of 25 mm
with total quantity not more than 10 per sq. m
Other knots and knot holes
Permitted up to an individual maximum diameter of 6 mm
with total quantity not more than 6 per sq. m

Total number of knots should not exceed 10 per sq. m
Repaired Defects (inserts)
No more ythan 8 pcs. per 1 sq. m of surface
Double Inserts
Not permitted
Closed checks
Permitted  for an individual  maximum length up to 200 mm
and in number  2 per 1 meter of panel width
Open checks (patched)
Permitted  for an individual  maximum width up to 2 mm
and for individual maximum length up to 200 mm
and no more than 2 per 1 meter of panel width
Maximum number of checks
4 per 1 meter of panel width
Irregularities in the structure of the wood
Permitted
Hearth and discoloration
No more than 30% of the surface
Defects at the edges due to sanding or sawing
Permitted up to 4 mm from the edge
Glue penetration
Permitted up to 2% of the surface
Sanding through
Not permitted
Veneer overlapping in inner plies
Permitted for an individual max. length up to 100 mm,
in number max. 1 per 1 meter of a panel width

Brochure Contents
Preview
Introduction to Grading
Plywood Technical Data
B
BB
CP
C
Volume of a Pack of Plywood
Thickness Conversion Table


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Concannon Lumber
2950 SE Stark St, Suite 230
Portland, OR 97214-3082
Tel:  503-231-8881
Fax:  503-236-5614
E-mail: