Plywood is typically categorized using letter-grading systems for its veneer surfaces, with common classifications spanning exterior appearance and structural utility. The top tier is A-grade, which features a smooth, sanded surface free of knots and ready for painting or finishing. The middle tiers include B and C grades, which permit small tight knots, minor discoloration, and plugged repair patches while maintaining structural soundness. The lowest standard exterior grade is D-grade, which allows large knots, open defects, and rough patches, typically reserved for hidden structural backing layers where visual appeal is entirely irrelevant.
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