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BS 1088 British Standard
Specification for Marine Plywood manufactured from selected untreated
Tropical Hardwoods
Specification
This British Standard applies to
plywood made with untreated tropical hardwood veneers having a suitable
prescribed 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'
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.
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.
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.
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.
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.
Moisture Content.
At the time of leaving the factory,
finished boards shall have moisture content from 6 to 14%
Finishing.
Boards will be sanded on both sides equally
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
Squareness
The lengths of the diagonals of a
board shall not differ by more than 0.25% of the length of the diagonal
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.
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
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.
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Homestead Hardwoods
6910 CR 249
Vickery, Ohio 43464
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