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some grading rules about plywood

Views:2     Author:Site Editor     Publish Time: 2020-06-05      Origin:Site


plywood grading rules differ according to the country of origin. The most popular standards are the British Standard (BS) and the American Standard (ASTM). Joyce (1970), however, list some general indication of grading rules:

GradeDescription
AFace and back veneers practically free from all defects.
A/BFace veneers practically free from all defects. Reverse veneers with only a few small knots or discolorations.
A/BBFace as A but reverse side permitting jointed veneers, large knots, plugs, etc.
BBoth side veneers with only a few small knots or discolorations.
B/BBFace veneers with only a few small knots or discolorations. Reverse side permitting jointed veneers, large knots, plugs, etc.
BBBoth sides permitting jointed veneers, large knots, plugs, etc.
C/DFor structural plywood, this grade means that the face has knots and defects filled in and the reverse may have some that are not filled. Neither face is an appearance grade, nor are they sanded smooth. This grade is often used for sheathing the surfaces of a building prior to being covered with another product like flooring, siding, concrete, or roofing materials.
WGGuaranteed well glued only. All broken knots plugged.
XKnots, knotholes, cracks, and all other defects permitted.
WBPWeather and Boil Proof used in Marine Ply. Designation replaced by EN 314-3.

JPIC Standards

GradeDescription
BB/CCFace as BB, back as CC. BB as very little knots of less than 1/4 inches, slight discoloration, no decay, split and wormholes mended skillfully, matched colors, no blister, no wrinkle. Most popular choice for most applications.

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