Sealing medium and characteristics of silicone rubber sealing ring

The common sealing materials of rubber sealing ring include metal sealing material, PTFE, synthetic rubber, flexible graphite sealing material, etc. DSH sealing ring tells you that the synthetic rubber sealing material includes styrene-butadiene rubber material and neoprene rubber material. , Silicone rubber material, EPM material, FPM material, NBR sealing material, etc. are all synthetic rubber sealing materials. What are the medium resistance of common rubber sealing materials for rubber sealing rings?

characteristic?

Small knowledge of silicone rubber encyclopedia:

Silicone rubber refers to the rubber whose main chain is composed of alternating silicon and oxygen atoms, and two organic groups are usually connected to the silicon atom. Ordinary silicone rubber is mainly composed of silicon-oxygen chain units containing methyl groups and a small amount of Z alkenyl groups. The introduction of phenyl can improve the high and low temperature resistance of silicone rubber, and the introduction of trifluoropropyl and cyano groups can improve the temperature and oil resistance of silicone rubber.

The medium and characteristics of synthetic rubber "silicon rubber" made of rubber sealing ring:

The silicone rubber of synthetic rubber in the rubber sealing ring material has the ability to resist high and low temperature with a large temperature difference. Studies have shown that the low (resistance) temperature of the silicone rubber of the rubber sealing ring material can be as low as -100 degrees Celsius, and the resistance (resistance) temperature can be as high as 350 degrees Celsius, and the stability (temperature resistance, heat resistance) performance is quite good, this may be the limit of silicone rubber!

The characteristics of rubber sealing silicone rubber are non-toxic and odorless. The most important thing is that it has no adverse reaction to the human body, that is, the solvent resistance performance is a bit poor, and it is easy to undergo ionic cracking under the action of acid and alkali. Decomposition reaction occurs.

Silicone rubber can be mainly used for animal and vegetable oil, mineral oil, oxygen, weak alkali, weak acid and other medium conditions under high temperature resistance, low temperature resistance, high-speed rotation and other occasions (environment). It is not suitable for use in medium conditions with solvent properties such as benzene, toluene, and acetone, and it is not suitable for high-pressure steam, because the rubber sealing silicone rubber also decomposes.