Early rubber was taken from rubber latex of Hevea brasiliensis and other plants, which were made of elastic, insulating, impermeable and air. High elasticity polymers. It is divided into two kinds of NR and synthetic rubber. Natural rubber is made from the gum tree, rubber grass and other plants after the extraction of gum; Rubber products are widely used in all aspects of industry or life.
The word "rubber" comes from the Indian language Cau-Uchu, meaning "the Weeping tree". Natural rubber is made from the latex of three-leaf rubber tapping when it is solidified and dried. In 1770, British chemist J. Priestley found that rubber could be used to erase pencil writing, which was then called rubber, and the word has been in use ever since. The molecular chain of rubber can be cross-linked, and when the crosslinking rubber is deformed by external force, it has the ability of rapid recovery and has good physical and chemical properties and stability. Rubber is the rubber industry's basic raw materials, widely used in the manufacture of tires, hose, tape, cables and other rubber products.