Black plywood for concrete structures
Black film plywood for concrete structures is made by bonding a number of thin veneers or cork or hardwood layers. Both sides are coated with phenolic foil and the edges are coated with a protective waterproof coating.
Plywood is graded according to the water resistance of the glue, and the layers for external or internal use are glued together.
The quality of finished plywood varies widely, with some plywood attractive particles and some plywood may contain agglomerates.