Plywood CORE GRADES buying Guide,inspection,quality control,sourcing tips,purchasing,manufacturing,import,export

CORE GRADES (From Table 7©)
Grade Description J Grade K Grade L Grade M Grade
Thickness of Crossband Adjacent to Faces Any Thickness Thicker than 1/10″ 1/10″ and thinner Any thickness Any thickness
Knotholes and Other Round Elliptical Openings (Max. Diameter) None 3/8″ 3/4″ 1″ 2 1/2″
Splits, Gaps, and Other Elongated End or Edge Openings – Visible on only one end or edge of panel (Max. Width) 1/8″ 1/4″ 1/2″ 1″
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