Professional training would be good for most of the Plywood QC/QA Parts 51: Some Plywood Surface manufacturing defects

Grade Description
I Permitted not more than 3 wood and manufacturing defects such as:

— lack of veneer, defects of panel edges due to sanding or trimming not more than 2 mm
— pin knots, sound intergrown light and dark knots, with diameter not more than 15 mm, partially intergrown, dead and loose knots, knot-holes, worm-hole with diameter not more than 6 mm — 3 per sq m
— splits max length 200 mm

II Permitted not more than 6 wood and manufacturing defects such as:

— pin knots, sound intergrown light and dark knots, with diameter not more than 25 mm
— partially intergrown, dead and loose knots, knot-holes, worm-hole with diameter not more than 6 mm – 6 per sq m
— splits max length 200 mm
— lap max length 100 mm
— lack of veneer on edges not more than 4 mm
— glue tape, glue bleed-through, not more than 2 %, pinholes, low spots, grain tear-out, not more than 5 %
— wood inlay patches

III Permitted not more than 9 wood and manufacturing defects such as:

— pin knots, sound knots, without limitations in diameter — partially intergrown, dead and loose knots, knot-holes, worm-hole with diameter not more than 6 mm — 10 per sq m
— open splits max length 300 mm or filled with putty max length 600 mm
— lap max length 200 mm
— lack of veneer, defects of panel edges not more than 200 mm
— glue bleed-through not more than 5%
— grain tear-out not more than 15 %
— gap in slice joint max width 2 mm
— wood inlay patches without limitations

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