BS 1088 PLYWOOD
We would like to thank World Panel Products for the
following.
BS 1088 British Standard Specification for Marine Plywood
manufactured from selected untreated Tropical Hardwoods
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Specification
This British Standard applies to plywood made with
untreated tropical hardwood veneers having a suitable
prescribe level of resistance to fungal attack with a bond
of WBP glue quality between the plies. It does not need to
be 'British made material'
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Bonding WBP Glue line
Bonding meeting the test requirements of this British
Standard and using an adhesive of the type which by
systematic tests and by records in service of the product
over many years has been proved highly resistant to
weather, micro-organisms, cold and boiling water, steam
and dry heat.
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Species of Timber
If so specified by the purchaser, Gaboon or Okoume
(Aucoumea klaineana), which is classed as non-durable, may
be used provided that the name of the timber is included
in the mark on the boards produced.
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Quality of Veneers
Veneers may be rotary cut or sliced. The method of
cutting is at the option of the manufacturer unless it is
specified by the purchaser at the time of ordering.
Veneers shall be smoothly cut.
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Face Veneers
These shall present a solid surface, free from open
defects. They shall be free from knots, other than sound
pin knots, of which there shall be no more than 6 in any
area 30cm square (1ft2), and not more than an average of 2
per 30cm square (1ft2) over the whole area of the board.
The veneers shall be reasonably free from irregular grain,
due note being taken to the characteristics of the species
being used. Isolated pinholes not along the plane of the
veneers, and occasional closed splits are permissible.
Veneers showing compression failure shall be excluded.
Occasional minor discoloration is permissible.
There shall be not more than one edge joint in any 30cm
(1ft2) width of the board, and the veneers shall, when
jointed, be matched for color. There shall be no end
joints.
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Core Veneers
The requirements for core veneers shall be the same as
those for face veneers, with the following exceptions.
Small splits are permitted, and there is no limitation on
the number of pin knots or edge joints. Discoloration is
permissible, provided this is free from dote. Veneers need
not be matched for color. There shall be no end joints.
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Limits of Manufacturing Defects in Plywood
Defective Bonding Not Permitted
Pleats and overlaps Not Permitted
Gaps In faces..Not permitted. Occasional gaps that occur
during manufacture may be repaired by means of well-fitted
veneer inserts bonded with a complying adhesive. In
Cores... In any edge of a board, not more than one gap,
which shall be not wider than 0.5mm. Obviously the
presence of defects in cores can only be judged by the
appearance of the edges.
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Moisture Content
At the time of leaving the factory, finished boards shall
have moisture content from 6 to 14%
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Finishing
Boards will be sanded on both sides equally
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Length & Width
The length or width of a board produced as a standard
size shall not be less than the specified size nor more
than 6.3mm (0.25") greater than the specified size
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Squareness
The lengths of the diagonals of a board shall not differ
by more than 0.25% of the length of the diagonal
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Thickness
Tolerances vary as follows.
4mm +.02/-0.6 6mm +.04/-0.65 9mm +.06/-0.75 12mm
+.09/-0.82
15mm +.1/-0.9 18mm +.12/-0.98 22mm +.16/-1.08 25mm
+1.8/-1.16
From the above we can assume that 6mm material will
arrive at thickness' between 6.04mm and 5.35mm.
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Face Veneer thickness
For any three-ply construction, which applies to 3 and
4mm material, each face veneer shall be not thinner than
1/8" of the total thickness of veneers assembled
dry.
Since the dry thicknesses of the boards are 3.6 and 4.6
respectively, we can assume that for these thicknesses
only the face veneers will be as follows:
3.6mm dry x 12.5% (1/8) = 0.45mm 4.6mm dry x 12.5% (1/8)
= 0.575mm
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Multi-Ply Construction
This applies to boards thicker than 4.8mm
(3/16")
Each face veneer shall be a minimum of 1.3mm and not
thicker than 3.8mm. Each core veneer shall be no thicker
than 4.8mm
World Panel Products will not be held
responsible for any errors or ommissions from the full
report. For a full copy, please call or fax your request.
Thickness
|
Wt/Sheet
|
Number of plies
|
1/8" (3mm)
|
10 lbs
|
3
|
5/32" (4mm)
|
13.2 lbs
|
3
|
3/16" (5mm)
|
16 lbs
|
5
|
1/4" (6mm)
|
20 lbs
|
5
|
3/8" (9mm)
|
30 lbs
|
5
|
1/2" (12mm)
|
40 lbs
|
7
|
5/8" (15mm)
|
50 lbs
|
9
|
3/4" (18mm)
|
60 lbs
|
11
|
Price snapshot, 11-2006. *Harbor Sales, **World Panel Products, ***Boulter Plywood Corp.
1/4" Douglas-fir AB Exterior: $35.65*
1/4" Douglas-fir AB marine: $43.00***
6 mm BS 1088 Okoume: $68.80**
Wood-Plywood Index
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