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BWP Grade Plywood
BWP stands for weather and boil proof. BWP Plywood is considered to be an exterior grade or marine grade. Using BWP glue for the plywood ensures that the panel can be exposed to humidity or moisture for a long time without delamination. Plywood is quite durable as it is made of three or more thin sheets of wood called veneers that are glued together. Each layer of wood is laid with the grain running at right angles to the next layer.
To test the durability of BWP plywood, you can take a few samples of the plywood and put it in boiling water. If the samples do not delaminate for a long period, we can conclude that the plywood has BWP property. The glues used in BWP plywood are melamine glue and phenolic glue. BWP plywood made with ordinary melamine can resist delamination in boiling water for four to eight hours. However, if better melamine is used, the plywood can withstand boiling water for around ten to twenty hours.
Phenolic glue is the best one to use in BWP plywood as they can go on without delamination for 24 to 72 hours in boiling water. Therefore, they are sometimes regarded as permanent adhesives. In addition to the quality of WBP glue, the water boiled proof period of plywood also depends on the craftsmanship of production.
The important features of the plywood can be summed up as follows.
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BWP plywood is specially treated so that it could withstand a high-moisture environment.
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Through specific stress-relieving treatment, the plywood gets its anti-warp properties, which makes it dimensionally stable in both dry and wet conditions throughout its life.
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It is chemically treated with selected preservatives to seal it off from termites and pests.
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Its high resistance to boiling water, moisture, dry heat and rough weather and climatic conditions, makes it perfect to be used in boat and ship building.
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| BWP GOLD | ||
| SIZES | THICKNESS | |
| 8X4 | 19MM | |
| 7X4 | 16MM | |
| 6X4 | 12MM | |
| 8X3 | 9MM | |
| 7X3 | 6MM | |
| 6X3 | ||
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Technical Specification IS:710 – 2010 |
|
TEST PRESCRIBED |
MINIMUM VALUE |
| Moisture Content Test | Not less than 5% |
| Glue adhesion strength | Min. Ind: 1100 N |
| (In dry state) | Avg: 1350 N |
| Adhesion Of Ply (Knife Test) | Minimum Pass Standard |
| Resistence to water | Minimun – 800 N |
| (after 72 hrs.boiling) | Average – 1000 N |
| Tensile Strength N/mm2 | 42.00 N |
| -Along the grain | 25.00 N |
| -Across the garin | 84.50 N |
| Sum of tensile strength | |
| Modulus of Elasticity N/mm2 | 7500 N |
| -Along the grain | 6700 N |
| -Across the grain | |
| Modulus of Rupture N/mm2 | Minimum- 45 N |
| -Along the grain | Average – 50 N |
| Across the grain | Minimum – 27 N |
| Average – 30 N | |
| Retention of Preservative Chemicals Kg/Cbm (CBB Type) | Min 12 kg |
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