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Home > Quality Standards > Industrial Plywood
  
  
  
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Industrial Plywood Quality Standard

Defects

A

B

C

D

E

Sapwood

No

Slight color difference

Slight color
difference

Yes

Yes

Heartwood

No

No

Slight color
difference

Yes

Yes

Color Streaks or Spots

Slight

Slight color difference

Slight color difference

Yes

Yes

Color Variation

No

Slight

Slight

Yes

Yes

Sharp Color Contrasts at Joints

No

No

Slight

Yes

Yes

Matching

Book Matched
Slip Matched
Pleasing Matched

Yes
Specify
--

Specify
Specify
Yes

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--
--

--
--
--

--
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Min. Nominal
Width of Face 
Components

Plain-S
Quarter
Rotary

127 mm
76 mm
127 mm

76 mm
76 mm
102 mm

No Limit

Small Conspicuous Burls & Pin Knots-Combined Avg. No.

4 per 1 m2

6 per 1 m2

No Limit

Conspicuous Burls-Max. Size

9.5 mm

12.7 mm

No Limit

Conspicuous Pin Knots-Avg. No.
Dark Part-Max. Dia.
Knots-Max. Dia.

4 per 3 m2 
3.2 mm
6.4 mm

4 per 1 m2 
3.2 mm
6.4 mm

No Limit

Scattered Sound & Repaired Knots-Combined Avg. No.
Max. Dia.-Sound
Max. Dia.-Repaired
Avg. No.-Repaired

No

4 per 3 m2 

9.5 mm
3.2 mm
4 per 3 m2 

4 per 3 m2

9.5 mm
3.2 mm
4 per 3 m2

4 per 3 m2

25.4 mm
19 mm
2 per 1 m2

No Limit

38 mm
25.4 mm
6 per 1 m2

Mineral Streaks

Slight

Slight

Slight

Yes

Yes

Bark Pockets

No

Max. area
3.2 x 25.4 mm

Max. area
6.4 x 50.8 mm

Max. area
6.4 x 50.8 mm

Yes

Worm Tracks

No

Slight

Slight

Yes

Yes

Vine Marks

Slight

Slight

Yes

Yes

Yes

Cross Bars

Slight

Yes

Yes

Yes

Yes

Rough Cut / Ruptured Grain

No

Slight

Slight

Max. no. 2
Max. dia
203 mm

5% of panel

Blended Repaired Tapering
Hairline Splits

Max. no. 2 Max. area 1 x 152 mm

Max. no. 4
Max. area 2
x 152 mm

Max. no. 4
Max. area 2
x 152 mm

Max. no. 6
Max. area 3 x 200 mm

Yes

Repairs

Small Blending

Blending

Yes

Yes

Yes

Quartered

25.4 mm in 305 mm maximum grain slope, 63.5 mm in 305 mm maximum grain sweep

· Unfilled wormholes, open splits, open joints, open bark pockets, or doze not allowed in above grades.
· Outside components will be a different size to allow for edge trim loss and certain types of matching.

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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