25mm Chinese Plywood - General Description :
The plywood surface veneers are of Okoume or similar red hardwood; the plywood core veneers are a species of poplar.
The board is normally manufactured with an odd number of plies, each ply being oriented at 90 degrees to the adjacent one, to create a balanced construction. The plywood face and reverse veneers run in the direction of the length of the sheet : long-grain plywood.
Thickness tolerances of plywood - differences are allowed from the nominal thickness of the board after sanding.
In the case of 25mm plywood, this is from 23.85mm to 25.2mm, as a mean thickness.
Length and width dimensions of the plywood are stated within +/- 1mm tolerance.
Adhesives used in the plywood manufacture are Phenol (WBP type) for the core veneers, and Melamine Formaldehyde (Type 1 Exterior) for the face veneers.
Plywood face grading is stated as B/BB
- a B plywood face is described as a neatly cut veneer, substantially defect free and sanded smooth;
- a BB plywood face allows minor defects, so long as they are filled and sanded.
These plywood face-grade descriptions are summarised from BS6566 - (which although not a current standard, has been adopted as a description by several Plywood Mills.)
Long-grain hardwood veneered plywood - many boards have a decorative veneer but would have to be selected if required for this use;
Weight per 8x4 x 1" plywood board is approximately 45Kg;
Moisture content of the plywood is approximately 10%;
Plywood Strength Data - non declared, NOT CE marked for structural use.
Applications - Furniture, Shopfitting, Exhibition Stands and general construction work. This board has an external glueline WBP (Water & Boil-Proof); WBP bonded plywood generally has a high resistance to humid and wet environments, although the forces of expansion in a saturated timber veneer may cause the veneer to actually split, while the glueline itself is sound. THIS DOES NOT INDICATE THAT THE PLYWOOD HAS BEEN MANUFACTURED INCORRECTLY - timber is a natural material subject to swelling when it absorbs moisture. Be aware that Poplar does not posses a high resistance to fungal decay in humid conditions. For long service in these conditions, design considerations and the appropriate weather-proof finish of the plywood are of the highest importance. The timber (especially end-grain) would need to be coated and maintained to a BS-CP external specification for any external use. These plywood boards have not been CE grade tested for structural uses such as floor decking, roof decking or wall sheathing - (although they are of comparable quality to ones that are CE marked.) We would be able to supply a CE marked plywood, but this would be at a higher price.
This ply is more stable and generally will swell, twist or warp less than a softwood sheathing plywood.
- Plywood origin, specifications and grading may change from batch to batch;
- Buyers should satisfy themselves as to the suitability of a particular plywood for their application, prior to use.