How To Distinguish Between NBR And FKM
Oil seal is a sealing element used to seal rotating shafts or reciprocating parts in mechanical equipment. Its function is to prevent the leakage of fluid media such as lubricating oil and hydraulic oil, and to prevent external dust and impurities from entering the equipment to ensure the normal operation of the equipment and the integrity of the lubrication system.
Oil seal is a sealing element used to seal rotating shafts or reciprocating parts in mechanical equipment. Its function is to prevent the leakage of fluid media such as lubricating oil and hydraulic oil, and to prevent external dust and impurities from entering the equipment to ensure the normal operation of the equipment and the integrity of the lubrication system.
Common materials for oil seals include nitrile rubber (NBR), fluororubber (FKM), silicone rubber (VMQ), etc. Today, NNK Factory will show you the difference between NBR and FKM materials
Distinguishing NBR and FKM can be done from the following aspects:
FKM: The operating temperature range is generally - 20°C to 250°C, and some special FKM can even reach 300°C, and it can still maintain flexibility and sealing performance in extremely high temperature environments.
FKM: Excellent resistance to almost all common chemicals, including strong acids, strong alkalis, solvents, etc. The only weakness is slightly lower resistance to some ketones and amines.
FKM: Excellent chemical resistance to most oils, including gasoline, diesel, aviation fuel, aromatics and ester oils, and almost no hardening, cracking or swelling will occur when exposed to high-temperature oil environments for a long time.
FKM: It has excellent weather resistance and can maintain its performance even when exposed to sunlight, ozone and other harsh environments for a long time.
FKM: It is difficult to burn and may extinguish itself after leaving the fire source. The flame is bright white, and irritating hydrogen fluoride gas is produced, which smells special and pungent.
FKM: Due to its excellent chemical resistance, it will not change significantly when it comes into contact with general ketones, aromatic compounds and other reagents.