Advantages
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There are always an odd number of veneers and each ply is at a right angle to the one below, this gives the material its strength. The more veneers used, the stronger the plywood becomes. Both the type of glue and veneers determine the suitability of a sheet for a particular application. The finish quality of plywood varies considerably, some plywood have attractive grains while others can contain knots. Plywood may be used indoors and outdoors. Plywood is graded for exterior or interior use depending upon the water resistance of the glue used to stick the plies together. Code letters are use to show grading on each sheet. Exterior grade plywood (WBP - Weather and Boil Proof). This type of plywood can be used outdoors. Water-resistant adhesives are used and can resist a certain amount of moisture.
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Uses
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Sheds and cladding are made from this material. WBP requires paint or varnish to protect the outer veneer from the elements. Internal plywood does not contain water-resistant adhesive. It may be used for wall panelling, flooring and furniture.
Shuttering boxes are made from shuttering plywood. Shuttering boxes are used in the construction industry to contain concrete while it sets. The material is water resistant to a certain extent. The surface of this material does not have a decorative veneer and is generally not suitable for use where an attractive quality finish is required.
Marine Plywood is made with waterproof adhesive so that it can be used under water. The material should still be protected with paint or varnish.
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Other codes used on the surface of plywood are: BR-Boil Resistant and MR-Moisture Resistant.
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Grading for plywood is based on the smoothness of its surface and the number of defects it has. Plywood can be nailed and screwed. Thin plywood is flexible and can be formed into curved shapes.
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Plywood consists of layers of veneer laid crossways to each other, glued and pressed together to form a sheet. Standard indoor plywood is not made with waterproof glue, separation of the layers may occur to the plywood sheet after being doused with water. Therefore you must treat the wood with sealer, varnish, or paint to waterproof and protect it. Exterior plywood is made using waterproof glue and pre-treated lumber which is, wood that has been waterproofed though chemical soaking. Treated wood has a greenish hue to its colour. Marine ply is the most expensive and is made with high quality materials and glues that have the highest moisture resistance. This type of plywood, as the name suggests, is often used in boat construction.
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Plywood is constructed by gluing together a number of layers (plies) of wood with the grain direction turned at right angles in each successive layer. This design feature makes plywood highly resistant to splitting. An odd number (3, 5, 7) of plies is used so that they will be balanced on either side of a center core and so that the grain of the outside layers runs in the same direction. The outer plies are called faces or face and back. The next layers under these are called crossbands and the other inside layer or layers are called the core. A plywood panel made of three layers would consist of two faces and a core.
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There are two basic types of plywood: exterior and interior. Exterior plywood is bonded with waterproof glues. It can be used for siding, concrete form, and other constructions where it will be exposed to the weather or excessive moisture. Interior plywood is bonded with glues that are not waterproof. It is used for cabinets and other indoor construction where the moisture content of the panels will not exceed 20%.
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Plywood can be made in thicknesses between 1/8 inch to more than 1 inch, commonly used sizes or thicknesses being 1/4, 3/8, 1/2, 5/8 and 3/4 inch. A standard panel is 4' wide by 8' long. Smaller size panels are available in the hardwoods.
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Plywood can be worked quickly and easily with common carpentry tools. It holds nails well and normally does not split when nails are driven close to the edges. Finishing plywood presents no unusual problems; it can be sanded or texture coated with a permanent finish or left to weather naturally.
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There is probably no other building material as versatile as plywood. It is used for concrete forms, wall and roof sheathing, flooring, box beams, soffits, stressed-skin panels, panelling, shelving, doors, furniture, cabinets, crates, signs and many other items.
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All plywood panels are quality graded based on products standard. The grade of each type of plywood is determined by the kind of veneer (A, B, C, or D) used for the face and back of the panel and by the type of glue used in construction.
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Hardwood Plywood
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A panel product composed of softwood inner layers-or plies - joined at right angles with adhesive to a hardwood veneer face and back. The term "hardwood plywood" indicates that the face and back veneers of the panel are 100% hardwood. Hardwood plywoods are used primarily for decorative purposes, while softwood plywoods are generally for construction or structural use. The core of a plywood panel is composed of an odd number of plies made from softwood veneers sandwiched at right angles to each other between the outside layers. The inner ply directly beneath the face is called the crossband. Alternating the direction of the grain is what gives plywood its strength and durability. Cores can also be made of particleboard, fiberboard or a combination. The outer surfaces are called the "face" or "back" ply.
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Process:
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Cutting:
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| Species: |
Tropical Wood
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| Grading Standards: |
JPIC, BS
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| Glue Type: |
MR, WBP
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| Sizes: |
1220mm x 2440mm
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| Thickness: |
2.7mm, 3.6mm, 5.2mm, 6.0mm, 9.0mm, 12.0mm, 15.0mm, 18.0mm
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| Origin: |
Malaysia & China
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