The main chain of silicone rubber (SR) rubber molecule is composed of Si-O bond, and the side group is mainly methyl. Depending on the type of silicone rubber, part of the methyl group can also be replaced by vinyl, phenyl or fluorine groups or atoms. The end groups can be methyl groups or hydroxyl groups, etc.

Where n, M and P are the number of chain nodes of different Si-O, respectively. There are many methods of silicone rubber classification. Here are four categories:

1. According to the vulcanization temperature, it can be divided into room temperature vulcanization silicone rubber and high temperature vulcanization silicone rubber;
2. According to the shape before curing, can be divided into solid silicone rubber, liquid silicone rubber;
3. According to the difference of the monomer used, it can be divided into methyl vinyl silicone rubber, methyl phenyl vinyl silicone rubber, fluorine silicon, nitrile silicone rubber, etc.;
4. According to the different performance and use of silicone rubber, it can also be divided into general type, super low temperature resistance, super high temperature resistance, high strength, oil resistance, medical type, etc.

Liquid silicone rubber (LSR) is a small amount of water as the initiator, or platinum as a catalyst, in the atmosphere or under the state of heating vulcanization crosslinking of an elastomer, according to the packaging form is divided into one component and two components (multi-component) two categories, according to the reaction type can be divided into condensation type or liquid silicone rubber. Liquid silicone rubber does not contain any stabilizers, plasticizers or promoters. As a crosslinking material, it can withstand very high temperatures without thermal aging and can maintain its mechanical properties and elasticity. By changing some of its side groups, the material can be modified to meet specific functions or requirements. LSR has excellent chemical stability, oil resistance and weather resistance, and can be stable in the temperature range of 50℃ to 180℃. With the addition of stabilizer, LSR can be stable at temperatures above 250℃, and has low temperature flexibility at -60℃. LSRS are usually transparent, can be used with additional pigments as needed, and are easily tinted. They are widely used in electronic component seals, pipe seals, medical devices, keyboards, and baby-related products. Liquid silicone rubber has great potential in 3D printing, waterproof, coating, food contact silicone and wearable parts. Of course, in the automotive industry, it also achieves a full range of applications, such as automotive connectors, electric vehicle battery seals, engine gaskets, headlight seals and shock absorbers, etc., becoming the preferred material to provide sealing, insulation and protection for internal applications solutions.

Rapidly changing technological trends in electric vehicle manufacturing are prompting silicone manufacturers to adopt innovative approaches to producing custom products. The solution of liquid silicone rubber in new energy vehicles mainly has four applications: sealing and waterproof, safety protection, structural thermal conductivity, lightweight. Liquid silicone rubber elastomer part is the most prominent products in the electric car market, its growth can be attributed to its extensive application, such as seals, shell and gasket, applied to various parts of heat insulation, such as connector sealing, heat sink, form a heat shield around the battery pack, protect cells from the effects of hot or too cold. In addition, a custom design can be used to insulate or help dissipate heat to ensure optimal operating temperatures. To accommodate harsh Spaces, silica gel is designed to withstand intense vibration. Short circuit and overcurrent are the main causes of battery failures in electric vehicles. The dielectric properties of silicone rubber can protect and isolate key components, making the battery and bus safe from surges and helping to prevent battery fires.