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| Home > Quality Standards > Particle Board |
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Particle Board with Veneer Quality Standard |
Defects |
Unit |
A |
B |
C |
Dead Knots,
Half Life Knots,
Insect Holes,
Resin Tracks |
No.
per m2 |
PB width
≤ 120 mm
|
Not allowed |
1 |
1 |
PB width
> 120 mm |
2 |
2 |
Life Knots |
Max. dia.
(mm) |
10 |
20 |
30 |
Half Life Knots |
Max. dia.
(mm) |
Not allowed |
5, compact |
10, compact |
Dead Knots |
Max. dia.
(mm) |
Not allowed |
Not allowed |
4, mended |
Inbarks |
Light Color |
Max. length
(mm) |
Not allowed |
10 |
20 |
Max. width
(mm) |
2 |
4 |
Dark Color |
Max. length
(mm) |
Not allowed
|
Not allowed
|
15 |
Max. width
(mm)
|
2 |
Resin Drops,
Resin Tracks |
Max. length
(mm) |
Not allowed
|
5 |
10 |
Max. width
(mm)
|
2 |
4 |
Rot |
Max. area
(% of total surface)
|
Not allowed
|
Not allowed
|
Not allowed
|
Discoloration |
Fungi,
Chemical Discoloration |
Max. area
(% of total surface)
|
Not allowed
|
Not allowed
|
20
(close shade)
|
Inner/Outer Color Difference |
Max. area
(% of total surface)
|
10
(close shade) |
No limit
(close shade) |
Initial Stages
of Decay |
Max. area
(% of total surface)
|
Not allowed
|
No limit
(close shade) |
Splits |
Closed |
Max. width (mm)
|
Not allowed
|
0.3 |
0.5 |
Max. length (mm)
|
100 |
200 |
No. per widthwise meter |
1 |
2 |
Open |
|
Not allowed
|
Not allowed
|
Not allowed
|
Mineral Streaks |
Max. length
(mm)
|
Not allowed
|
20 |
40 |
Outer-Ply Open Joints |
Max. width
(mm)
|
Not allowed
|
0.3 |
0.5 |
Max. length
(mm)
|
200 |
300 |
Imprints (mm) |
Not allowed
|
0.5 |
1 |
Hollowness, Imprints, Bumps |
Max. area
(mm) |
Not allowed
|
Not allowed
|
100 |
No. per m2 |
1 |
Mending |
No. per m2 |
Not allowed
|
Not allowed
|
3 |
Max. area
(% of total surface)
|
0.5 |
Torn Grain |
Max. area
(% of total surface)
|
Not allowed
|
1, light |
3, splits should be mended |
Excess Glue, Surface Contamination |
Max. area
(% of total surface) |
Not allowed
|
Not allowed
|
1, discrete |
Sanding Marks |
Max. width
(mm)
|
Not allowed
|
3, on the edges |
8, on the edges
|
Blade Marks |
Max. width
(mm)
|
Not allowed
|
Not allowed
|
0.3, slight |
Edge Defects |
Max. width
(mm)
|
Not allowed
|
Not allowed
|
3 |
Other Defects |
Should not impair product aesthetics |
N.B. When a particular grade has been agreed for one face, the other face shall be considered acceptable provided that it meets grade C. |
Dimensional Tolerances
| Item |
Dimension |
Tolerance |
| Thickness (mm) |
< 9 |
+/- 0.30 |
| ≥ 9 |
+/- 0.50 |
| Width (mm) |
1220 |
+/- 0.50 |
| Length (mm) |
2440 |
+/- 1 |
| Cross Length Warping (mm) |
|
≤ 4 |
| Length Warping (mm) |
For Particle Board with a thickness > 6, warping shall not exceed 1.0% of the length |
Physical and Mechanical Properties
| Item |
Parbicle Board 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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