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Home > Quality Standards > Block Board
  
  
  
  Plywood   Block Board   Particle Board   3 Ply Shuttering Panels
  

Block Board 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

Uniform core strips
No insect holes or rot permitted
No gaps between core strips

Core Mending

Mended with wood-wool

Panel Edge

Smooth

Dimensional Tolerances

Item Dimension Tolerance
Thickness (mm) < 9 +/- 0.3
≥ 9 +/- 0.5
Width (mm) 1220 +/- 0.5
Length (mm) 2440 +/- 1
Cross Length (mm)   ≤ 2
Veneer Thickness (mm) not below 0.3 mm after sanding
Moisture Content (%) < 9 mm 8 - 12
≥ 9 mm 8 - 14

N.B. Different specifications can be considered

 
  
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