Jun 23，2025 by Dawn Group

Why Choose HNBR for Extreme Temperature Resistance?​

HNBR for Extreme Temperature Resistance

In extreme high or low temperature environments, traditional rubber materials often fail due to aging, hardening or embrittlement. HNBR significantly improves its temperature resistance and chemical stability through a unique hydrogenation process, making it an ideal choice for industries such as automotive, energy, and aerospace.

Analysis of HNBR's Heat Resistance

High Temperature Resistance

HNBR converts the carbon double bonds (C=C) in the butadiene chain segment into single bonds (C-C) through selective hydrogenation, thereby:
 
  • Reducing the active sites for oxidation reactions and delaying thermal aging.
  • Maintaining mechanical properties stability and operating temperature up to 150°C.

Low temperature elasticity retention

The acrylonitrile content of HNBR (18%-50%) can be adjusted, and the low acrylonitrile formula remains flexible at -40°C, which is better than the -20°C lower limit of fluororubber (FKM).

Dawn HNBR

Dawn Special Elastomer Co., Ltd. is an enterprise that develops, produces, and sells HNBR with high technology content and high added value, and at the same time extends the processing and production of mixed rubber to the downstream.

The HNBR plant has a designed capacity of 3,000 tons per year, and the first phase of 1,000 tons was officially produced in 2019. The HNBR produced by Dawn Special Elastomer Co., Ltd, makes China the third country in the world to break through HNBR technology in industrialization, besides Germany and Japan.

Dawn HNBR offers better thermal oxygen aging (working at 150℃ for a long time), ozone resistance, radiation resistance, chemically corrosive medium resistance(good resistance to hydrogen sulfide), and good dynamic properties, while maintaining the oil resistance and wear resistance of NBR.

For more details, please visit the HNBR product page.

HNBR vs. Alternative Materials: Performance Comparison

Property​​ HNBR​​ ​​Standard NBR​​ FKM​​ ​​EPDM​
Temperature Range (°C)​​ -40°C ~ +150°C -20°C ~ +120°C -20°C ~ +200°C -50°C ~ +150°C
Short-term Peak (°C)​​ +180°C +130°C +230°C +175°C
Oil Resistance ​ ★★★★★ (Excellent) ★★★☆☆ (Moderate) ★★★★★ (Excellent) ★☆☆☆☆ (Poor)
​Chemical Resistance​​ ★★★★☆ ★★☆☆☆ ★★★★★ ★★★☆☆
Tensile Strength (MPa)​​ 20~30 15~25 10~20 10~15
​Abrasion Resistance​​ ★★★★★ ★★★☆☆ ★★★★☆ ★★★☆☆
Cost Index​​ ★★★☆☆ (Mid-to-High) ★★★★★ (Low Cost) ★★☆☆☆ (High Cost) ★★★★☆ (Moderate)
Typical Applications​​ Turbocharger hoses, Oilfield seals Low-pressure seals Chemical processing seals Cooling systems, Outdoor seals

FAQ

Q1: How to choose HNBR grade? ​

A: Choose according to the application scenario requirements:

  • Temperature range: Choose a low acrylonitrile (18%~24%) formula for ultra-low temperature environments.
  • Media type: High acrylonitrile (45%~50%) is more suitable for fuel contact.
  • Mechanical load: High hydrogenation degree (>95%) improves tear resistance.

Q2: Can HNBR replace FKM for use in environments above 200°C? ​​

A: Not recommended. FKM is still the first choice for ultra-high temperatures (200°C~230°C), but HNBR is more cost-effective below 150°C.

Q3: How do I get Dawn HNBR technical parameters?

A: Please fill out the form, and we will contact you within 24 hours.