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BS1088 Summary, and the tolerances we allow under our production guidelines

Here follows a summary of the requirements for BS 1088 as interpreted by our company.  Our 5 x 10 plywood definition has changed, and does not meet this BS1088 standard, but still qualifies as a high end Exterior Marine Plywood. The actual specification is several pages long, and we have condensed what we figure are the relevant bits of information.

BS 1088 British Standard Specification for Marine Plywood manufactured from selected untreated Tropical Hardwoods *(excl 5 x 10)

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.

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 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.

Face 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.

The 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. (April 2010)

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.

3mm +0.2/-0.4 (Can be as low as 2.6mm, no thicker than 3.2mm)  

4mm +0.2/-0.6 (Can be as thin as 3.4mm, no thicker than 4.2mm)

6mm +0.4/-0.65 (Can be as thin as 5.35m, no thicker than 6.4mm)

9mm +0.6/-0.75 (Can be as thin as 8.25mm, no thicker than 9.6mm)

12mm +0.9/-0.82 (Can be as thin as 11.18mm, no thicker than 12.9mm)

15mm +1.0/-0.9 (Can be as thin as 14.1mm, no thicker than 16mm)

18mm +1.2/-0.98 (Can be as thin as 17.02mm, no thicker than 19.2mm)

22mm +1.6/-1.08 (Can be as thin as 20.92mm, no thicker than 23.6mm)

25mm +1.8/-1.16 (Can be as thin as 23.84mm, no thicker than 26.8mm)

 

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 (approx 12.5%) 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 minimum thickness (WPP specifically requests 0.8 to 1.0mm)

4.6mm dry x 12.5% (1/8) = 0.575mm minimum thickness (WPP specifically requests 0.8 to 1.2mm)

For 3mm, WPP would supply between 2.8 to 3.2mm maximum tolerance)

For 4mm, WPP would supply between 3.7 to 4.2mm maximum tolerance)

Multi-Ply Construction.

This applies to boards thicker than 4.8mm (3/16")

Each face veneer shall be a minimum of 1.1mm and not thicker than 3.8mm. Each core veneer shall be no thicker than 4.8mm

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World Panel Products will not be held responsible for any errors or omissions from the full report. For a full copy, please call or fax your request

 

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Our products usually ship in 1-3 days on IN stock items. Some items need to be ordered in. These items can take anywhere from 5-15 business days to arrive to us and we will then promptly ship your order out. Some products might no longer be available and a refund will be issued on such items ordered through our website. Business days are considered Monday through Friday. Customers who request immediate shipment, please call for availability. Items that are not in stock typically ship in 10-20 business days. While we try our best to keep products in stock and the Web site up-to-date, they do not necessarily reflect the latest information available.  We are not responsible for incorrect or out-dated product or images.
 

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