Specification:
This British Standard Applies to plywood made with untreated tropical hardwood veneers having a suitable prescribed level of resistance of fungal attack with a bond of WBP glue quality between the piles. It does not need to be 'British made material'.

Bonding in Marine 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 frees from knots, other than sound pin knots, of which there shall be no more than 6 in any area 30 cm square(1 ft 2), and not more than an average of 2 per 30 cm square (1 ft 2), 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 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(1 ft 2) width of the board, and the veneers shall, when jointed, be matched for color. there shall be no end joints.

Core Veneers
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. D
Discoloration is permissible provided this is free from dote. veneer's 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 that gaps occur during manufacture may be repaired by means of well-fitted veneer inserts bonded with a complying adhesive. in cores. in any edge of 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 8 to 10%

Finishing
Boards will be sanded on both sides equally.

Length & Width.
The length of 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.

Squarness
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