Under what circumstances can the silicone sealing ring not be used?

Everyone has seen silicone sealing ring, and it has many advantages. First of all, its heat resistance can work in very low temperature environment, the minimum temperature can reach - 100 ℃, and it has good oxidation and ozone resistance in the air. Because of the molecular structure of silicone, silicone sealing ring has good permeability and good selectivity for gas, Because it is non-toxic and odorless, silicone sealing rings are used in many food and medical industries.

Excellent insulation performance is another advantage, but proper addition of carbon black, nickel powder and aluminum powder in the material can also increase its conductivity. Silicone sealing ring also has hygroscopic property, which can absorb and insulate water in the environment, but has poor water vapor resistance. Said so many advantages of silicone rubber sealing ring. In fact, its shortcomings are also obvious, which determine the environment in which it is not suitable to use silicone sealing ring.

First of all, it is not suitable to use silicone sealing ring under working pressure of more than 50 pounds. Although silicone rubber is compatible with most oils, compounds and solvents and has good acid and alkali resistance, it has no resistance to alkane and aromatic oils. In addition, it is not recommended to use silicone sealing rings in most concentrated solvents, oil products, concentrated acids and diluted caustic soda solutions.

Some special silicone sealing rings added with special ingredients also have the properties of radiation resistance, fire resistance and oil resistance, but the disadvantage of silicone rubber is that its mechanical properties are poor. It is not recommended to use silicone sealing rings in the environment where there is stretching, tearing and strong wear in the working environment. Generally, it is only used as static sealing.