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Home > Quality Standards > Pine Plywood
  
  
  
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Hpl Plywood: Hpl Plywood
  
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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