Criteria for choosing plywood from birch

Plywood is a popular material in construction.

Such building materials are made from various species of trees.

Choice criteria

The plywood from birch is used in different climatic conditions, since low and too high temperatures do not affect the properties of the original raw materials. In accordance with the state standard, birch plywood is divided into varieties.

Birch plywood has many advantages: strength, moisture resistance and unique texture. Therefore, raw materials are in demand in various fields.

When choosing raw materials, buyers pay attention to:

• The density, which in birch is from 700 to 750 kg per cubic meter. This value is several times higher than the density of veneer of coniferous trees;

• Liszt weight. This indicator is important for determining the load on the constructed structure;

• The thickness of the sheet. To use plywood, for the purpose of interior decoration, they choose raw materials with a thickness of 2 to 10 mm.

Birch products varieties

The variety is determined by the presence of defects and knots on the product. On the boards of the first grade of the edge of the sheet can be damaged by an area of ​​not higher than 2 mm. Pinocchio knots should be no more than three pieces per square meter.

The second variety admits the presence of defects on the surface of the material in an amount of not more than 6. such characteristics include a change in the shade of the sheet, the overlap of the material on the outer layers, excavations and scratches, and other mechanical damage.

Birch of the third grade can include flaws in the amount of not 9: double inserts, flowing glue (not higher than 5%), cracks and holes from falling knots. Sheets of 4 varieties allow the presence of the same defects as in the previous case. In addition, GOST allows wormholes, cracks, glue, villus and sagging raw materials.

The highest grade are class E plywood. On a product with this marking, no, even the most insignificant defects are unacceptable.

Advantages of plywood motors

One of the advantages of birch plywood is moisture resistance. This property is understood as the ability of the material not to collapse after the influence of moisture and subsequent drying. The moisture -resistant board absorbs the liquid and retains its shape for many years.

The polished surface has high value in the market, so its price is higher than the non -pended sheet. The main advantage of this property is the variety of areas of application due to the strength and smoothness of the material.