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Quick Answers

What does WBP mean in plywood?
WBP stands for Weather and Boil Proof. It refers to the adhesive used to bond the veneer layers — specifically, adhesive that passes a cyclic boiling water test without delaminating. WBP plywood uses phenolic or melamine resin glue and is rated for outdoor and high-moisture applications including formwork, marine construction, and exterior cladding.
What is the difference between softwood and hardwood plywood?
The distinction refers to the veneer face species. Softwood plywood uses species like Douglas fir, pine, or spruce and is typically used for structural and construction applications. Hardwood plywood uses species like birch, oak, maple, or tropical hardwoods and is preferred for furniture, cabinetry, and decorative applications. The terms do not directly indicate strength — birch plywood (hardwood) is very strong, but so is Douglas fir plywood (softwood).
What does the plywood grade stamp mean?
A plywood grade stamp indicates the face and back veneer quality, the adhesive type, and the certifying body. For example, a stamp reading 'B-C EXT' means a B-grade face, C-grade back, and exterior-rated adhesive. In APA-graded panels, additional markings show the span rating, mill number, and product standard. European CE-marked panels reference EN standards for structural performance.
What is veneer core vs MDF core plywood?
Veneer core plywood has a core made entirely of thin wood veneer layers glued in alternating grain directions. MDF core plywood replaces the inner veneers with medium-density fiberboard, producing a smoother surface for painting and edge banding but with less screw-holding strength and moisture resistance. Veneer core is preferred for structural and construction use, while MDF core suits interior furniture and cabinetry.