OSB (oriented strand board) is a multi-layer sheet consisting of 3-4 layers of wood chip. Each layer of an OSB sheet consists of oriented lat chips hot-pressed under high pressure with the use of phenol formaldehyde resin as a bonding agent and synthetic wax as a waterproofing agent.
Properties of OSB-3
- easy installation
- moisture resistance, good environmental stability without any additional conservation; OSB-3 does not decay and remains firm after being immersed in water for 24 hours (but can swell ~10%)
- constancy of parameters, uniform structure
- high strength: physical and mechanical properties of OSB-3 approximate those of coniferous plywood
- wasteless use of the material
- attractive appearance
Strands are usually oriented longitudinally in the outside layers and transversely in the inside layers.
As well as plywood OSB is widely used in furniture industry and as a base for shingle roofing.
perpendicular orientation of layers ensures high resistance to bending and increased elasticity along the main axis of the board.
OSB can be easily worked: cut, drilled, nailed, chipped … At the same time OSB can tightly hold crews and other fastenings. OSB does not chip, it is straight, strong and moisture resistant.
OSB has the following advantages as compared to wood: greater strength, directional resistance to bending.
Working lifespan of an OSB structure is unlimited subject to proper engineering, construction and operation.
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