HNBR (Hydrogenated NBR) O-rings
-30 °C to 150 °C
HNBR is a hydrogenated version of NBR with higher temperature resistance and better resistance to ozone, heat, and wear. Premium choice for automotive and high-temp applications.
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Temperature and chemical compatibility
Temperature and chemical compatibility
Temperature range: -30 °C to +150 °C (short-term up to +170 °C).
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Typical applications: air conditioning, turbochargers, fuel systems, high-temperature automotive applications, oil and gas applications.
HNBR (Hydrogenated NBR)
Each elastomer has different mechanical and chemical properties.
HNBR (Hydrogenated NBR) — properties and applications
HNBR (hydrogenated nitrile) is an improved version of NBR — it's produced by hydrogenating it, which gives it higher temperature resistance and significantly better resistance to wear, tearing and ozone. It's a robust material for more demanding operations, where ordinary nitrile no longer cuts it. HNBR O-rings work in a temperature range of −30 to +150 °C (briefly up to +170 °C) and their typical hardness is 75 ShA.
The material gets on excellently with mineral oils and fuels and, compared with NBR, copes better with water, ester oils and higher temperatures. Thanks to its high mechanical strength it withstands dynamic loading and wear better than most ordinary elastomers — which is why it lasts where an O-ring is moving and continuously loaded. It's precisely this combination of resistance to oils and fuels at elevated temperature and under mechanical stress that makes HNBR a reliable choice for tough operations.
On the other hand, don't use an HNBR O-ring for steam and hot water, strong acids and bases, or glycol-based brake fluids — here you should choose a different material (EPDM for steam and brake fluids, FKM for aggressive chemistry). Although HNBR is more robust than nitrile, it isn't a chemically universal material; its strong suit remains oils and fuels at higher temperature, not resistance to solvents or acids.
Typical uses are found in the automotive industry — air-conditioning, turbochargers, fuel systems and injection — and, more generally, in dynamic seals under higher stress, where an O-ring is moving and exposed to wear. It also sees use in the oil and gas industry, where pressure, temperature and contact with hydrocarbons are combined. In the material hierarchy HNBR sits between inexpensive NBR and premium FKM: choose it when NBR stops being enough on temperature or mechanical stress, but you don't yet need to pay for the full chemical resistance of FKM. It's a sensible compromise between cost and performance for hotter and tougher oil and fuel applications.
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O-ring material comparison
Indicative values for a quick comparison. Temperature ranges are conservative (continuous service); for a specific medium always verify compatibility or consult a technician.
| Material | Temperature range | Mineral oil | Water | Acid | Fuel | Hardness (Sh A) | Relative price (vs NBR) |
|---|---|---|---|---|---|---|---|
| NBR | -30 – 100 °C | Excellent | Limited | Avoid | Excellent | 70 Sh A | 1.0× |
| HNBR — your selection | -30 – 150 °C | Excellent | Limited | Avoid | Excellent | 75 Sh A | 3.0× |
| FKM | -20 – 200 °C | Excellent | Limited | Excellent | Excellent | 75 Sh A | 5.0× |
| FFKM | -20 – 260 °C | Excellent | Excellent | Excellent | Excellent | 75 Sh A | 50.0× |
| EPDM | -40 – 130 °C | Unsafe | Excellent | Excellent | Unsafe | 70 Sh A | 1.2× |
| VMQ | -60 – 200 °C | Avoid | Excellent | Avoid | Avoid | 70 Sh A | 3.5× |
| PU | -40 – 80 °C | Excellent | Limited | Avoid | Limited | 90 Sh A | 2.0× |