Rubber is divided into natural rubber and synthetic rubber according to raw materials. It can be divided into block raw rubber, latex, liquid rubber and powder rubber. Latex is colloidal aqueous dispersion of rubber; Liquid rubber is an oligomer of rubber, which is generally viscous liquid before vulcanization; Powdered rubber is the emulsion processed into powder to facilitate batching and processing. The thermoplastic rubber developed in the 1960s does not need chemical vulcanization, but uses the processing method of thermoplastic to form. Rubber can be divided into general type and special type. It is an insulator, which is not easy to conduct electricity, but it may become a conductor if it is exposed to water or at different temperatures. Conductivity refers to the easy conduction of electrons of molecules or ions inside a substance.