About 2000 of the world different plants can produce similar to natural rubber polymer, from which 500 is obtained in different types of rubber, but the real practical value is Brazil of Hevea brasiliensis. The surface of rubber tree is cut, the bark of the duct was cut, latex outflow from the tree. Collecting latex from rubber trees, diluted acid coagulation, washing, drying, tabletting, and packing, natural rubber is prepared commercially available. Natural rubber according to different methods of glue can be made of the tobacco leaves, dry film, crepe, technical classification of dry rubber and latex concentrate etc..

Natural rubber

Standard rubber or plastic granules, new types of natural rubber was developed in twentieth Century 60. Previously, general tobacco, crepe, dried slices of the traditional products regardless of the classification method, method of manufacturing are bound on the development of natural rubber. Therefore, Malaysia in 1965 began to implement the standard rubber plan, the development of rubber particles in the rubber production using physical chemical properties on the basis of classification. Standard rubber refers to the mechanical impurities, plasticity retention rate, initial plasticity, nitrogen content, ash content, ash content, color index and other physicochemical property indicator grading of rubber. Standard rubber packing is relatively advanced, polyethylene film packaging in general, and have a distinctive mark, the weight of the package is small, easy to move. Malaysia packaging weight is 33.3kg, the provisions of China 40kg.

Grading standard glue more scientific, so the classification method of quickly for the major natural rubber producing countries and the international organization for standardization, accept, and has developed a grading standard rubber. These standards are generally the same, but not completely consistent. For example, the provisions of ISO2000 is divided into five grades, China standard GB8081 - 87, the provisions of four grades.