Plywood
Plywood is stronger and more dimensionally stable than timber of the same thickness. That is because it is constructed by gluing an odd number of sheets of veneer with the grain of adjacent sheets at right angles to each other. This provides stiffness and reduces the amount of moisture movement in the timber. 3 Ply is the most economical and most readily available ply. In the US it was know as “veneered stock”. It comes in many grades, interior, moisture resistant, marine, for use in many varied situations. Timber, metal and plastic decorative veneers are often faced onto plywood.
Blockboard
Blockboard is a sheet product, which is constructed from softwood timber core strips of up to 30mm (1 ¼ in) wide, which are glued between outer veneers whose grain runs in the opposite direction. It is used for shelving, worktops, cupboards and doors. It is less expensive than laminboard.
Laminboard
Laminboard is constructed in a similar fashion as blockboard but the core strips are not more than 7mm wide. It is a finer quality timber board with a better finish than blockboard, with greater stability and the pattern of the timber strips doesn’t show through onto the veneered surface.
Chipboard (Particle Board)
Chipboard is made from chips of timber combined with synthetic resins bonded to form boards (sheets) by applying mechanical pressure and heat. They have a low strength and stiffness, good fire resistance and air tightness. The moisture movement is similar to that of timber. There are two forms of constructing chipboard – they are the extruded method and the platen press method.The extruded method is the cheapest and weakest of the boards. It is made by extruding or pushing the wood chips and resin through two heated plates, which arranges the particles vertically and they are easily broken off.The Platen Press method is where the timber chips and resin are pressed between two heated plates which arranges the particles horizontally making the board stronger than the extruded method/ This form of board is available in two forms, single layer (a course surface) or triple layer which has the coarse core with finer chips top and bottom creating a smoother finished board, which is then sanded. The surface can now be painted.
Chipboard sheets are available in three densities, high medium and low. The higher the density, the stronger the board. High Density Board is used for flooring.To know more visit our site http://allindiayellowpage.com/.