Crude rubber is a mixture of siloxanes. Its molecules belong to a chain-like spiral structure, with an average molecular weight between 400,000 and 800,000 mPa.s. Its viscosity is directly related to its molecular weight. The molecular weight can be measured with a Ubbelohde viscometer, which is probably the so-called viscosity average molecular weight. Regarding the reinforcing mechanism of the filler, it is understood that the people on earth have not yet fully understood it. It is probably that the filler nano-sized SiO2 powder (precipitation method SiO2 powder) is evenly distributed in the raw rubber to form a crystal-like structure. The hydroxyl groups on the surface of the SiO2 particles form hydrogen bonds with the Si-O bonds of the raw rubber, and each SiO2 particle acts as a A core, extending hydrogen bonds in all directions to connect with the raw rubber molecular chain, countless such structures, plus other additives, form a high-viscosity and high-performance rubber compound.
The performance (quality) is similar to that of general silicone rubber. As the "silicone rubber" Baidu Encyclopedia said, silicone rubber has excellent heat resistance, cold resistance, dielectric properties, ozone resistance and atmospheric aging resistance. The outstanding performance of silicone rubber is that it can be used at a wide temperature range of -60 ℃ (or lower temperature) to +250 ℃ (or higher temperature) for long-term use. As for which performance (quality) is superior, it is determined by the types of raw rubber, fillers and additives used.

After kneading the raw silicone rubber, white carbon black and other fillers in a kneader, it is kneaded by adding crosslinking agent, catalyst, inhibitor, various pigments, etc. on a two-roll rubber mixing machine. The resulting rubber compound is called a silicone rubber compound.

The compound rubber is solid silicone rubber. Usually a one-component glue, crosslinking agent, catalyst, inhibitor and rubber compound are mixed together. Compound rubber is generally formed by high temperature vulcanization after extrusion, unlike liquid rubber, which is mostly two-component and has three types: room temperature vulcanization, low temperature vulcanization, and high temperature vulcanization. In addition, silicone rubber is very environmentally friendly.