According to its commodity form, silicone rubber can be divided into two categories: mixed silicone rubber and liquid silicone rubber. Mixed silicone rubber, usually also called hot vulcanized silicone rubber, is composed of linear high polymerization degree (5000-10000 siloxane structure unit) of organic siloxane with reinforcing filler, incremental packing and made from a variety of performance additives, given the basic material, when used with curing agent, after forming, vulcanization made products, belongs to the radical polymerization.

Liquid silicone rubber and mixing rubber is different, is a medium degree of polymerization of linear polysiloxane as the base polymer, adding crosslinking agent, reinforcing filler and other coordination agent prepared with self leveling or thixotropic base material, with water in the air as initiator or vulcanized crosslinking elastomer under the heating of the catalyst. According to its vulcanization mechanism, liquid silicone rubber can be divided into two systems: condensation type and addition molding.