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| Home > Quality Standards > Pine Plywood |
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Pine Plywood Quality Standard |
Defects |
A |
B |
C |
Sapwood |
Allowed |
Allowed |
Allowed |
Heartwood |
Allowed |
Allowed |
Allowed |
Color Streaks or Spots |
Slight |
Allowed |
Allowed |
Color Variation |
Now Allowed |
Slight |
Allowed |
Matching |
Book Matched |
-- |
-- |
-- |
Pleasing Matched |
Allowed |
Allowed |
No Limit |
Knots |
Allowed |
Allowed |
Allowed |
Conspicuous Pin Knots |
Allowed |
Allowed |
Allowed |
Max. Size-Sound Knots
Max. Size-Repaired Knots
Avg. No.-Repaired Knots |
50.8 mm
50.8 mm
19 mm |
89 mm
89 mm
38 mm |
Yes
Yes
No Limit |
Mineral Streaks |
Less |
Less |
Allowed |
Bark Pockets |
Max. area 3.2 × 25.4 mm |
Max. area 3.2 × 50.8 mm |
Allowed |
Torn Grain |
No Allowed |
Slight |
Allowed |
Blended Repaired Tapering
Hairline Splits |
Allowed |
Allowed |
Allowed |
Repairs |
Blend |
Blend |
Allowed |
Knife Mark |
-- |
-- |
-- |
Unfilled wormholes, open splits, open joints, open bark pockets, or doze not allowed in above grades. |
Dimensional Tolerances
| Item |
Dimension |
Tolerance |
| Thickness (mm) |
< 9 |
+/- 0.30 |
| ≥ 9 |
+/- 0.50 |
| Width (mm) |
1220 |
+/- 0.50 |
| Length (mm) |
2440 |
+/- 1 |
| Cross Length (mm) |
|
≤ 2 |
| Cross Length Warping (mm) |
|
≤ 4 |
| Length Warping (mm) |
For plywood with a thickness > 6, warping shall not exceed 1.0% of the length |
Physical and Mechanical Properties
| Item |
Plywood Base |
| Moisture Content (%) |
8 - 12 |
| Adherence Test at the Core |
Maximum separation after boiling and stretching 25 mm |
| Adhesive Strength of the Veneer (MPa) |
≥ 0.50 |
N.B. Different specifications can be considered
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