- Jul 24, 2017 -
The above industrial and agricultural production and the improvement of life, are inseparable from the material. According to statistics, by 1984, the World's chemical substances in practice of about 9 million species, of which about 43 of the material. Although the number of materials, according to chemical composition classification, can be summarized as metal materials, inorganic non-metallic materials and polymer materials three categories. There is also the inclusion of composites as the fourth class, or as a new type of material derived from the three categories. In general, except the metal is metallurgical door production of products, the rest are chemical production materials.