O rings, also known as rubber rings and sealing rings are the most frequently used type of seal. It is due to the fact that installation of O rings is very easy and that they require little space. If the selected material the design of the groove are suitable, sealing based on
O-Ring may play its role for a longer time (provided that the permitted temperature ranges, etc. are adhered to).
Fluorocarbon (FKM/FPM) commonly known by its DuPont? trade name, Viton?. These materials are noted for their high resistance to temperatures and chemicals. They have excellent resistance to ageing and ozone and very low gas permeability that makes them suited to vacuum applications.
Heat Resistance up to 200°C, Cold Flexibility down to approximately -40°C
It is suitable used in Mineral oil and greases (low swelling in standard oil tests); silicon, mineral and vegetable oils and greases; aliphatic hydrocarbons (propane, butane natural gas); aromatic hydrocarbons (benzene, toluene); chlorinated hydrocarbons (carbon tetrachloride, trichlorethylene); fuels incl high methanol content; high vacuum work
However, it can not be used in Glycol based brake fluids; ammonia gas; amines and alkalies; superheated steam; low molecular weight organic acids (eg formic, acetic)
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