The material of the oil seal
Commonly used materials for oil seals are: nitrile rubber, fluorine
rubber, silicone rubber, acrylic rubber, polyurethane,
polytetrafluoroethylene and so on.
Nitrile rubber (NBR):It has good heat resistance, wear resistance,
resistance to various lubricating oils, greases, oil and gas
mixtures, etc., and the applicable temperature is -30 to 120
degrees Celsius, but it cannot be used in phosphate ester hydraulic
oils and gear oils containing extreme pressure additives. Used in
medium, stable performance in gasoline and mineral oil with low
aniline point.
Polyacrylate rubber (ACM):Excellent oil and heat resistance, wear
resistance, ozone resistance, UV radiation resistance, especially
resistant to lubricants, gear oils, motor oils, engine oils,
petroleum hydraulic oils, etc. containing extreme pressure fluids,
suitable for -30~150 degrees Celsius Scope work.
Fluororubber:It is resistant to aging, heat and oil, and is
suitable for almost all lubricating oils, fuel oils and gasolines.
It is not easy to harden in oils containing extreme pressure
additives, but it has poor cold resistance and high temperature
wear resistance, and large permanent compression deformation. The
temperature is -20~250 degrees Celsius.
Silicone Rubber:With outstanding resistance to high and low
temperature, it can be used for a long time at 150 degrees Celsius
without performance changes; it can be used continuously for 10000h
at 200, and it can maintain its unique flexibility and ozone
resistance within the working temperature range of -70~260. Weather
and other advantages.
PTFE:It has outstanding chemical stability, thermal stability,
friction reduction and self-lubricity, and its cracking temperature
is above 400. Therefore, it can work normally in the temperature
range of -200~300 degrees Celsius. In addition to free fluorine and
alkali metals, it has excellent corrosion resistance to chemicals,
solvents, hydroxides and acids.