HNBR is created by partially or fully hydrogenating NBR. The hydrogenating process saturates the polymeric chain with accompanying improvements to the ozone, heat and aging resistance of the elastomer and improves overall mechanical properties.
HNBR, like Nitrile, increasing the acrylonitrile content increase resistance to heat and petroleum based oils and fuels, but decreases the low temperature performance.
Temperature Range (dry heat)
low
high
-20 °F -30 °C
300 °F 150 °C
Application Advantages
» excellent heat and oil resistance » improved fuel and ozone resistance (approximately 5X) over Nitrile » abrasion resistance
Application Disadvantages
» increased cold flow with hydrogenation » decreased elasticity at low temperatures with hydrogenation over standard nitrile
Primary Uses
Modifications
O-rings, rubber seals and custom molded rubber components for: » Oil resistant applications » Oil well applications » Fuel systems, automotive, marine, and aircraft » General Industrial Use
» acrylonitrile content (ACN) from 18% to 50% » peroxide vs. sulfur donor cure system
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