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Basic elastomers for O-Rings
The following paragraph briefly reviews various elastomers currently available for use in O-Rings and other seals.
HNBR (Hydrogenated Acrylonitrile-Butadiene Rubber)
Hydrogenated acrylonitrile-butadiene rubbers are produced by selective and controlled hydrogenation of NBR. The highly saturated polymethylene chains demonstrate excellent heat and ozone resistance whereas the nitrile groups provide oil and fuel resistance. Increasing the degree of hydrogenation results in improved heat and ozone resistance.
As would be expected, increasing the nitrile content in HNBR results in reduced swelling in mineral oils, but with hardly any loss in low temperature flexibility compared to the regular NBR. The operating temperature range of HNBR is -25 to +150°C.
HNBR is resistant to:
• Aliphatic hydrocarbons
• Vegetable and animal fats and oils
• HFA, HFB and HFC fluids
• Dilute acids, bases and salt solutions at moderate temperatures
• Water and steam up to 150°C
• Ozone, ageing and weathering
HNBR is not compatible with:
• Chlorinated hydrocarbons
• Polar solvents (ketone and ester)
• Strong acids
HNBR elastomers fill a gap between NBR and FKM in many areas of application. In general they are used to replace NBR whenever the resistance to excessive heat or aggressive environments is critical. In contrast to conventional FKM compounds, HNBR elastomers can withstand basic additives such as amine-based corrosion inhibitors. For this reason, HNBR compounds are used in oil-field operations. They maintain their performance in difficult conditions, whereas NBR and most of the conventional FKM elastomers show a certain amount of degradation.
|TABLE 3: MAIN CHARACTERISTICS HNBR . H70N00C
|HNBR – H70N00C
||-25 / +150°C
||ALIPHATIC HYDROCARBONS: (FUEL, BUTANE, PROPANE, NATURAL GAS) ANIMAL AND VEGETABLE OILS HYDRAULIC FLUIDS WATER AND STAM UP TO 150°C OZONE, AGING RESISTANT
||OIL AND FUEL RESISTANT COMPONENTS AUTOMOTIVE INDUSTRY
|NOT COMPATIBLE WITH:
|CHLORINATED HYDROCARBONS (TRICHLOROETHYLENE, CARBON TEREACHLORIDE POLAR SOLVENTS (KETONE, ACETONE, ACETIC ACID) STRONG ACIDS