What does CP mean in plywood?

Single piece face and back CP/CP: Single piece face and back. Face and back grade veneers allow unlimited sound knots and repaired splits and unlimited patches. The panel is sound both sides and designed for laminating. C/C: Patches, open knots, and small veneer splits allowed.

andersonplywood.com - Plywood Grading Information

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Timber is a natural product and has an infinitely varying range of characteristics and appearances. The Hardwood Plywood and Veneer Association of America ( HPVA ) have created a set of rules called the Voluntary Standard for Hardwood and Decorative Panels commonly known as grading codes, which define allowable ranges of appearances and behavior for different species of hardwood plywood. Knotholes up to 4″ in diameter are permitted. open splits, and joints limited by width and length. Repaired splits, joints, bark pockets, laps and knotholes can achieve a sound surface if specified by the buyer.

HARDWOOD PLYWOOD (IMPORTED)

Imported Plywood is graded with a face and back grade designation.

B/BB: Single piece face and back veneer. Face veneers are considered clear and free of defects with a light-uniform color. Back allows 3-6 color matched patches, which are oval in shape and egg sized. Inner cores are solid birch single piece veneers. BB/BB: Single piece face and back. Both face and back veneers allow 3-6 small color-matched patches on average and some light mineral streaks. Tight pin knots may be present. Inner cores are solid single piece veneers. BB/CP: Single piece face and back. The “CP” back veneers are downgraded from “BB” grade veneers, which allow for unlimited patches and sound knots, but does not allow for open defects. Inner cores are solid birch single piece veneers. CP/CP: Single piece face and back. Face and back grade veneers allow unlimited sound knots and repaired splits and unlimited patches. The panel is sound both sides and designed for laminating. C/C: Patches, open knots, and small veneer splits allowed. Veneer lap and small core voids permitted. This panel is not sanded and would be used for structural purposes. SHOP GRADES: Shop panels are offered in the full 60” X 60” format in all of the grades listed above. Panels allow for 1-3 splits on the face veneer along one edge of the panel in lengths no longer than 10” and no wider than ¼”. Shop grades offered at a substantial discount to the “on grade” prices.

The explanation of grades listed above is a general overview.

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