Cork, commonly known as Quercus. Plants cork layer is very well developed skin product species, surface protection organization stems and roots grow bold after. Quercus and other species have many different, the difference between the most prominent of which is its bark can naturally regenerated after each dissection. Cork stripping must wait until the trees grow to 20 years later, when the diameter of the tree reaches 70cm, in order for the first time stripping. The resulting skin, said head and said skin or newborn skin. After every 10 to 20 years and then stripping the resulting skin called two leather or regenerated leather, thick skin in 2 cm or more.

Cork's chemical composition:

Suberin 45 percent - the main component of the cell wall, the decision resilient cork.

Lignin acid 27% - insulating compounds;

Polysaccharide 12% - of cell wall components, determines the texture of the cork;

Tannic acid 6% - polyphenolic compounds, determine the color of cork;

Sterol 5% - a hydrophobic compound, the water resistance of the decision cork;

Softwood features:

Cork is considered a gift of nature, has a unique characteristic, internal cork cork is made up of tiny cells of the "honeycomb" and complex acid composition, and filled with mixed gases like air. Per cubic centimeter of cork contains an average of 40 million cells. Therefore often cork color, texture, light, soft, flexible, impermeable, easy action by chemicals, and is electrical, thermal and acoustic poor conductor. From the surface of the body of the dead was 14 cells, arranged radially between each hexagonal prism. Typical cell diameter of 30 microns, the cell thickness of 1 to 2 microns. There conduit between cells. Spacing between two adjacent cells by five layers, two of which are fiber properties, followed by two layers of cork layer, the middle layer is a layer of wood, each one cubic centimeter in 50 million or more cells . This structure allows the cork has a very good elasticity, tightness, insulation, sound insulation, electrical insulation and abrasion resistance, coupled with non-toxic, tasteless, the proportion of small, soft, easy to fire, etc., has not so far man-made products can be worthy of its rival. Chemical properties, a hydroxy fatty acid ester and a mixture of the several acids formed is a characteristic component of cork, cork grease collectively.

Such materials decay resistance, chemical resistance, and therefore in addition to the concentrated nitric acid, concentrated sulfuric acid, chlorine, iodine and other corrosive effects of water, oil, gasoline, organic acids, salts, esters and so chemically inert. Very versatile, such as the making corks, refrigeration equipment insulation, life buoy, soundproof panels.