NITI Ventures

HNBR O-Rings

HNBR is an advanced nitrile family developed from NBR to provide better heat resistance, improved ozone and weather resistance, and stronger mechanical performance in demanding industrial service.

Typical temperature rangeAbout -30°C to +140°C typical, with short-term peaks higher in some compounds.

Other namesHNBR, Hydrogenated Nitrile, Hydrogenated Nitrile Butadiene Rubber

Hardness optionsCommon HNBR hardness options may include 60, 70, 80, and 90 Shore A.

Compliance optionsDepending on compound, HNBR may be available with REACH / RoHS declarations, automotive or industrial specification-based grades, and other application-specific approvals.

Best used for

Oil and grease sealing in tougher environments
Higher-temperature applications than standard NBR
Dynamic sealing where strength matters
Abrasion-resistant service
Heavy-duty machinery and automotive applications

Key advantages

Better heat resistance than standard NBR
Stronger ozone and weather resistance than standard NBR
Very good mechanical strength
Good abrasion resistance

Performs well in

Many oils
Greases
Lubricants
Some fuel-related applications
Ozone and weather exposure
Applications requiring strong mechanical durability

Use with caution or avoid

Very aggressive chemicals needing premium fluoroelastomer performance
Hot water and steam unless specifically validated
Applications where EPDM is needed for water-based compatibility
Applications requiring broader chemical resistance

Typical applications

Automotive systems
Compressors
Pumps
Heavy industrial equipment
Hydraulic and pneumatic systems in compatible media
Dynamic sealing where abrasion resistance matters

Common industries

Automotive
Industrial machinery
Fluid power
Oil and gas support equipment
Heavy equipment
Manufacturing

When to choose HNBR

Choose HNBR when you need a tougher step up from NBR with better heat, ozone, weather, abrasion, and mechanical performance.

When not to choose HNBR: Avoid or review carefully when your application involves broad aggressive chemical exposure, water or steam service better suited to EPDM, or when standard NBR already meets the requirement more economically.

Selection guide

This is a practical selection guide. Final material choice should always be checked against actual fluid, temperature, pressure, movement, environment, and any approval requirement for the exact compound.

Other materials

Need help selecting the right material?

Tell us your fluid, temperature, pressure, size, and whether the seal is static or dynamic. We can help review the most suitable starting options before final size and compound selection.