BS 1088 British
Standard Specification for Marine Plywood manufactured from selected
untreated Tropical Hardwoods *(excl 5 x 10)
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
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.
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.
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
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
Veneers in 5 x 10 sheets will be manufactured using no more than three
pieces of veneer, face-jointed together. The quality of those (up to)
three pieces will be the same quality as expected for 4'x8' face
veneers. The 5x10 panels manufactured this way will be classified as
Okoume Marine Exterior WBP Plywood.
bending strengths, MOE, moisture resistance and overall quality of panel
will match the construction qualities of a BS1088 panel, but now need to
be made this way due to the abject shortage worldwide of large size
Okoume logs originating from Africa.
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.
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
Limits of Manufacturing Defects in
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.
At the time of leaving the factory,
finished boards shall have moisture content from 6 to 14%
Boards will be sanded on both sides
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
The lengths of the diagonals of a board
shall not differ by more than 0.25% of the length of the diagonal
Tolerances vary as follows.