Birch plywood consists of veneer layers glued with phenol formaldehyde resin (Exterior Glue), so this product has increased moisture resistance. This material can be used in many areas, including, furniture production, transport, construction and repairs, and many other industries.
Birch plywood is divided into three categories according to the type of surface treatment: polished (S2S), polished on one side (S1S) and non-polished (NS).
Grades of birch plywood surfaces are as below (this is a brief list of defects only) :
Grade B(1). Virtually without defects. Allowed deviations: changes of sheet surface color of no more than 15%, holes from fallen-out knots up to 5 mm in the amount of up to 3 pcs/m2.
Grade BB(2). Allowed deviations: changes of color of up to 70%, knots and cracks can be patched with veneer matched in color.
Grade CP(3). Allowed deviations: changes of color without limitation, defects can be puttied.
Grade C(4). Defects of processing and the structure of wood, holes and cracks may be patched.
Each sheet has two surfaces, and thus grades are be labelled as, B/B, B/BB, BB/BB, BB/CP, BB/C, CP/CP, CP/C, C/C.
