Plywood floor : grade , size, thickness

production and scope

plywood material for the production of veneer needs.Make it as follows: heat-treated and purified from the bark of the log begins to rotate around its axis and shoot "wide chips" with the shelling of the knife.This is the veneer.Then it is dried, raskraivajut, sorted.Then the fabric is spread in such a way that their fibers are perpendicular to each other and coat with adhesive on both sides.At the final stage of the plywood can be laminated and sanded, but not always.

Applications plywood extremely diverse.It is used in construction, shipbuilding and industrial machinery for packaging goods and materials, furniture, etc.For example, in construction it is suitable for both interior and outdoor decoration of any kinds.In particular, it is widely used as a floor covering, since it has high water resistance, durability and reliability.

By using plywood in shipbuilding and mechanical engineering advantage is its high corrosion resistance and lightness.It is because the material easy to stack and transport.And when you create a furniture (table tops, shelving, kitchen furniture and bathroom) is of particular importance aesthetically pleasing appearance and low cost of plywood.

plywood Classification

plywood can classify the material from which made, impregnation, the number of layers.If we talk about the material, the two types of wood used most often: coniferous (spruce, fir, larch) and birch.The first are more suitable for ornamental purposes.The second (birch plywood) is used in all areas of construction.By the number of layers of plywood is divided into: 3, 5, and multilayer.

Speaking of impregnation, it is necessary to increase moisture resistance.In this regard, plywood sheets are divided into: ABF, PSF, FC, FB, BS, BA. first (BAF) glued albuminokazeinovym natural glue.Second (PSF) coupled phenol formaldehyde glue.Still others (FC) made using urea composition.Fourth (FB) is first treated with a varnish and then glued together.Fifth (BS) impregnated with alcohol-bakelite composition.Well, six (BV) - a water-soluble mixture of bakelite.

the way, has a plywood dimensions: 1525h1525, 1270h1525 and 1220h1525 mm (FC sheets).A PSF paintings usually other parameters: 1500h3000, 1220h2440, 1525h3050, 1250h2500 mm.

This plywood, the thickness of which may range from 1.5 to 40 mm, and even classified by the type of surface treatment: NSH, W1 and W2, which consequently means: unpolished, grinding on one side and on both sides.

varieties of plywood, or how to find quality stuff?

in accordance with GOST there are 5 grades of this material.Grade E is considered to be elite.Defects in it almost never occur.Further, the quality is first-rate, in which a crack and warp may be no more than 20 mm.Class II may have defects as small as 200 mm.In general, they should be no more than 2% of the total area.

Third Class wormhole, up to 10 pieces per 1 square meter.Fourth - the most low-grade variety.It can be knots, edge defects wormholes to 40 mm and more.Therefore, when buying the material, be sure to consider the variety.It is also important to know, to see where exactly it is needed.For example, it is the plywood, which is suitable for laying laminate will not always be suitable for the formwork.