Commercial Plywood Quality Standard |
Defects |
Unit |
Face |
Back |
|
|
BB/BB
Grade |
BB/CC
Grade |
BB/BB
Grade |
BB/CC
Grade |
Pin Knots |
Allowed |
Live knots |
Max. dia. (mm)
|
19 |
25 |
19 |
30 |
Max. no. per m2
|
2 |
3 |
2 |
5 |
Half-Live knots; Dead Knots (no fall off); Inbarks Altogether
|
Max. no. per m2 |
Not allowed
|
2 |
Not allowed
|
4 |
Half Live knots
|
Max. dia. (mm) |
Not allowed
|
10 |
Not allowed
|
No limit |
Dead Knots
(no fall off)
|
Max. dia. (mm) |
Not allowed
|
4 |
Not allowed
|
20 |
Inbarks
|
Max. dia. (mm) |
Not allowed
|
15 |
Not allowed
|
20 |
Closed Splits |
Max. area (mm)
(% of total surface) |
Not allowed
|
Not allowed
|
Not allowed
|
2 x 300
permitted;
repaired
with similar
color putty |
Insect Holes |
Max. dia.(mm) |
Not allowed
|
2 |
Not allowed
|
Max. no. 4
Max. dia. 2 mm
|
Max.no. per m2 |
4 |
No limit
|
Face Contamination |
Max. area
(% of total surface) |
Not allowed
|
Not allowed
|
Not allowed
|
0.5 |
Discoloration |
Max. area
(% of total surface) |
Not allowed
|
5 |
Not allowed
|
40 |
Rot |
Max. area
(% of total surface) |
Not allowed
|
Veneer Shortage & Damage of Four Corners |
Not allowed
|
Not allowed
|
Not allowed
|
Not allowed
|
Delamination |
Not allowed
|
Blisters |
Not allowed |
Sand Through |
Not allowed |
Torn Grain |
Max. area
(% of total surface) |
Not allowed
|
Not allowed
|
Not allowed |
5 |
Excess Sanding |
Not allowed
|
Mending |
Max. size per surface |
Not allowed
|
Not allowed
|
Not allowed |
≤ 50 x 100 mm
(boat shape) |
Max. no. per surface |
3 |
Core Grade |
First grade and second grade mixed
For 3 mm, must be first grade |
Core Voids |
≤ 3 mm |
Overlap & Splits
at the Other Cores |
Max. length (mm) |
≤ 10 |
Overlap & Splits
at the Core
Adjacent to the Top
& Bottom Veneers |
Max. width (mm) |
Not allowed
|
1.5 |
Not allowed
|
3 |
Max. no. |
2 |
3 |
Core Mending |
Mended with wood-wool |
Panel Edge |
Smooth |
Hollowness / Imprints / Bumps |
Max. surface (mm2) |
Not allowed
|
20 |
Not allowed
|
40 |
Max. no. per m2 |
1 |
1 |
Max. depth (mm) |
0.4 |
Allowed if there is no breach |
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