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| Home > Tech Info > Plywood Standard And Grade > South East Asian Plywood Grading Rules |
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| · South East Asian Plywood Grading Rules |
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GENERAL GRADING RULES - SOUTH EAST ASIAN PLYWOOD
(INCLUDING CHINESE OKOUME FACED POPLAR PLYWOOD) |
| 1. GRADE BB/CC |
Particulars
|
Face
|
Back
|
|
Sound
live knots
|
Max
diameter
25mm
Not clustered Max 6 per panel
|
Max
diameter
40mm
Max 6 per panel
|
|
Dead
knots &
Knot holes
|
Not
permitted
|
Max
diameter
15mm
,
well filled and Sanded. Max 2 per panel
|
|
Open
knot holes
|
Not
permitted
|
As per
face
|
|
Live pin
knots
|
Permitted
|
As per
face
|
|
Sound
burls
|
Permitted
|
As per
face
|
|
Dry
pitch pockets
|
Permitted
if well filled Max size 100 x
4mm
,
max 2 per panel
|
As per
face
|
|
Minor
natural
Discolouratioon
|
Permitted
if only slightly conspicuous
|
As per
face
|
|
Stains
/ mineral streaks
|
Permitted
if only slightly conspicuous
|
As per
face
|
|
Decay
|
Not
permitted
|
Permitted
if not conspicuous
|
|
Cross
split
|
Hairline,
max
100mm
in length
Permitted, Max 1 per panel
|
As per
face
|
|
Open
split
|
Hairline,
max
100mm
in length
Permitted, Max 3 per panel (unfilled)
|
As per
face
|
|
Filled
splits
|
Max size
150 x
5.0mm
, max 2 at each
End, well filled and matched for colour
|
Max size
300 x
10.0mm
, max 2 at each
end well filled and matched for colour
|
|
Putty
smear
|
Permitted
if not conspicuous
|
As per
face
|
|
Pinworm
holes / tracks
|
Not
permitted
|
Occasional
pinworm holes permitted if Scattered, well filled and matched for colour
|
|
Pin
holes
|
Permitted
if not conspicuous and
Not clustered
|
Permitted
if tight
|
|
Vine
marks
|
Permitted
if occasional, level and
smoothly sanded
|
As per
face
|
|
Rough
cut
|
Permitted
if not conspicuous and
smoothly sanded
|
As per
face
|
|
Torn
grain
|
Permitted
if slight
|
As per
face
|
|
Patches
|
Permitted
if not conspicuous, max 3 per panel.
|
As per
face
|
|
Shims
|
Permitted
if not conspicuous and do not exceed 300 x
5.0mm
long grain.
|
As per
face
|
|
Veneer
joints
|
Max 2
per panel, well made, parallel to edges and well matched for colour and grain
direction
|
Max 3
per panel, well made, parallel to edges and well matched for colour and grain
direction
|
|
Tape or
glue residue
|
Permitted
if slight and smoothly sanded
|
As per
face
|
|
Knife
marks
|
Max
0.7mm
if smooth and not
conspicuous
|
As per
face
|
|
Sanding
|
Smooth,
free from conspicuous
Streaks or chatter
|
Smooth
|
|
Bark
|
Permitted
if very slight
|
As per
face
|
|
Mechanical
defects
(oil stains, chain marks,
sanding burns etc)
|
Not
permitted
|
Permitted
if not conspicuous
|
|
Wet
pitch
|
Not
conspicuous
|
As per
face
|
|
Press
marks
|
Not
permitted
|
Not
permitted
|
|
Core
gaps
|
Permitted,
max 150 x
15mm
but plugged
|
|
|
Core
overlaps
|
Permitted
but not severe
|
|
|
Blisters
/ delamination
|
Not permitted
|
|
|
Short
core veneers
|
Not
permitted
|
|
|
|
|
|
|
|
Note:The aforementioned grading rules are not based on any specific grading rules and are a combination of BSI, IHPA & JPIC grading rules which are open to different interpretations.
Furthermore, these rules are intended to be used as a general guidelines only and no responsibility will be accepted for qualities which do not comply with these guidelines. |
| |
GENERAL GRADING RULES - SOUTH EAST ASIAN PLYWOOD
(INCLUDING CHINESE OKOUME FACED POPLAR PLYWOOD) |
| 2. GRADE B/BB |
Particulars
|
Face
|
Back
|
Sound
live knots
|
Max
diameter
13mm
Not clustered Max 4 per panel
|
Max
diameter
25mm
Max 5 per panel
|
|
Dead or
unsound knots
|
Not
permitted
|
Not
permitted
|
|
Open
knot holes
|
Not
permitted
|
Not
permitted
|
|
Pin
knots
|
Permitted
if tight and not clustered
|
Permitted
|
|
Sound
burls
|
Permitted
if smooth
|
Permitted
|
|
Dry
pitch pockets
|
Not
permitted
|
Permitted
if well filled,
Max size 100 x
4mm
,
Max 2 per panel
|
|
Minor
natural Discolouratioon
|
Permitted
if not conspicuous
|
Permitted
if only slightly conspicuous
|
|
Stains /
mineral streaks
|
Permitted
if not conspicuous
|
Permitted
if only slightly conspicuous
|
|
Decay
|
Not
permitted
|
Not
permitted
|
|
Cross
split
|
Hairline,
max
100mm
in length
Permitted, Max 1 per panel
|
As per
face
|
|
Open
split
|
Hairline,
max
100mm
in length
Permitted, Max 3 per panel (unfilled)
|
As per
face
|
|
Filled
splits
|
Max size
150 x
3.0mm
, max 2 at each
End, well filled and matched for colour
|
Max size
300 x
5.0mm
, max 2 at each
end well filled and matched for colour
|
|
Putty
smear
|
Permitted
if not conspicuous
|
Permitted
if not severe
|
|
Pinworm
holes / tracks
|
Not
permitted
|
Occasional
pinworm holes permitted if Scattered, well filled and matched for colour
|
|
Pin
holes
|
Not
permitted
|
Permitted
if not conspicuous
|
|
Vine
marks
|
Max size
100 x
4.0mm
, max 2 per Panel
if level and smoothly sanded
|
Permitted
if occasional if level and smoothly sanded
|
|
Rough
cut
|
Permitted
if smoothly sanded
|
Permitted
if smoothly sanded
|
|
Torn
grain
|
Permitted
if very slight
|
Permitted
if slight
|
|
Patches
|
Not
permitted
|
Permitted
if not conspicuous, max 3 per Panel.
|
|
Shims
|
Not
permitted
|
Permitted
if not conspicuous and do not exceed 300 x
5.0mm
long grain.
|
|
Veneer
joints
|
Max 1
per panel, well made, parallel to edges and well matched for colour and grain
direction
|
Max 2
per panel, well made, parallel to edges and well matched for colour and grain
direction
|
|
Tape or
glue residue
|
Not
permitted
|
Permitted
if slight and smoothly sanded
|
|
Knife
marks
|
Not
permitted
|
Max
0.7mm
if smooth and not
Conspicuous
|
|
Sanding
|
Smooth,
free from conspicuous Streaks or chatter
|
Smooth
|
|
Bark
|
Not
permitted
|
Permitted
if very slight
|
|
Mechanical
defects (oil stains, chain marks,
sanding burns etc)
|
Not
permitted
|
Permitted
if not conspicuous
|
|
Wet
pitch
|
Not
permitted
|
Not conspicuous
|
|
Press
marks
|
Not
permitted
|
Not
permitted
|
|
Core
voids
|
Permitted,
max
5mm
wide filled with
veneer
|
|
|
Core
gaps
|
Permitted,
max 200 x
5.0mm
,
smooth and not severe
|
|
|
|
Note:The aforementioned grading rules are not based on any specific grading rules and are a combination of BSI, IHPA & JPIC grading rules which are open to different interpretations.
Furthermore, these rules are intended to be used as general guidelines only and no responsibility will be accepted for qualities which do not comply with these guidelines |
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