The main component of silicone rubber is a polymer composed of silicon and oxygen elements. Specifically, silicone rubber is composed of polydimethylsiloxane (PDMS), which is a linear or cross-linked polymer connected by silicon oxygen bonds.

In addition to silicon and oxygen, silicone rubber may also contain some other elements and compounds to adjust its performance and characteristics. For example, in order to increase the elasticity and softness of silicone rubber, it is often necessary to add organic silicone crosslinking agents, such as silane crosslinkers. In addition, auxiliary materials such as fillers, plasticizers, and pigments can also be added to improve the physical properties of silicone rubber.

Overall, the main component of silicone rubber is polydimethylsiloxane composed of silicon and oxygen elements, and its properties and characteristics can be adjusted by adding other compounds and auxiliary materials.