Material
HNBR O-Ring Material Guide
Hydrogenated nitrile properties and high-temperature oil service.
Polymer
Hydrogenated nitrile (HNBR)
Temperature range
−40 °C … +150 °C
Hardness
70–90 Shore A
Overview
HNBR is nitrile with the polymer backbone hydrogenated, which raises heat, ozone and ageing resistance well above standard NBR while keeping nitrile's oil and fuel resistance. It also offers high mechanical strength, making it common in automotive air-conditioning and oilfield service.
Strengths
- • Continuous service to +150 °C, far above standard NBR
- • Retains nitrile's mineral oil and fuel resistance
- • High tensile strength and abrasion resistance
- • Good ozone, weather and ageing resistance
Limitations
- • Higher cost than standard NBR
- • Attacked by ketones, esters and chlorinated hydrocarbons
- • Not suitable for glycol brake fluid
- • Limited resistance to strong acids
Compatible media
Mineral oils & greasesRefrigerants with lubricant (R134a)Fuels & hydrocarbonsOzone & weathering
Media to avoid
Ketones & estersChlorinated hydrocarbonsGlycol brake fluidStrong acids
Typical applications
Automotive air-conditioning systemsEngine and timing-system sealsOilfield and downhole equipmentHigh-strength industrial hydraulics
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