Jun 24，2025 by Dawn Group

How HNBR Enhances Reliability in Harsh Environments

How HNBR Enhances Reliability in Harsh Environments​

In extreme conditions, traditional elastomers often fail due to aging, swelling, or mechanical degradation. ​​Hydrogenated Nitrile Butadiene Rubber (HNBR)​​ significantly improves temperature resistance, oil compatibility, and chemical stability through selective hydrogenation. This article explores HNBR’s core properties and how ​​Dawn HNBR​​ delivers tailored solutions for critical applications.

Market Demand for High-Performance Elastomers​

With the development of automotive turbocharging, deep-sea oil drilling and other technologies, rubber materials face three severe challenges:
 
  1. High temperature/low temperature: Turbocharger pipelines have to withstand 150°C for a long time, while Arctic equipment seals require -40°C without brittle cracking.
  2. Chemical corrosion: Hydrogen sulfide (H₂S) and acidic and alkaline media in oil fields accelerate rubber degradation.
  3. Mechanical stress: High-pressure hydraulic systems cause permanent compression deformation of seals.
 
Solution:
HNBR reduces the unsaturated bonds in the nitrile rubber (NBR) molecular chain through selective hydrogenation, thereby improving oxidation resistance and oil resistance.
 

HNBR's Core Performance in Harsh Environments

Temperature Resistance

  • ​High temperature stability: After 3000 hours of continuous operation at 150°C, the tensile strength retention rate is >80%.
  • ​​Low temperature flexibility: It remains elastic at -40°C.

Oil Resistance and Chemical Stability​

HNBR's oil resistance and chemical stability are its key advantages over ordinary nitrile rubber (NBR). Through the hydrogenation process, the unsaturated double bonds in the HNBR molecular chain are partially or completely saturated, which greatly reduces its swelling and degradation risks in oils, fuels and chemical media.

Mechanical Properties Under High Pressure

The unique molecular structure of HNBR gives it excellent resistance to compression set, high wear resistance and long-term stability, allowing it to maintain reliable sealing performance even under extreme pressure conditions.

Dawn HNBR's Competitive Advantages

Dawn Group has achieved remarkable results in the field of HNBR. 
 
In terms of technology research and development, it has jointly developed HNBR technology with Beijing University of Chemical Technology. It can independently develop a highly active hydrogenation catalyst system and achieve industrial-scale production with a large-scale amplification, ranking at the global leading level. It also has the capabilities to develop a complete set of industrial process package technology for HNBR and construct production devices. 
 
In terms of application research, it has the basic research capabilities for HNBR applications, equipped with an HNBR compound production line and subsequent compound application research. 
 
In terms of production capacity, it has built its own HNBR production device with a Phase-I production capacity of 3,000 tons per year, and plans to increase it to 5,000 tons per year in 2025. 
 
In terms of product performance, it shows excellent compression-set performance, high tensile strength, and good comprehensive performance in high-end sealing, synchronous belt, oil-field equipment, and other fields.
 

How to choose HNBR grade? ​

The following table shows the Dawn HNBR grades. If you have any questions about choosing a grade, please feel free to contact our professional team.

  • Whatsapp: (+86)18730167652

  • Email: advert@chinadawn.cn

Item Unit DN3406 DN3408 DN3416 DN3418 DN3426 DN3428 DN3448 DN3404LX
DN3448L
DN3428L
DN3428D
DN3408L
Acrylonitrile Content %
34.0±1.5
34.0±1.5
34.0±1.5
34.0±1.5
34.0±1.5
34.0±1.5
34.0±1.5
34.0±1.5
34.0±1.5
34.0±1.5
34.0±1.5
34.0±1.5
Mooney Viscosity

ML1+4100℃
 
55～70
 
 
80～95
 
 
55～70
 
 
80～95
 
 
55～70
 
 
80～95
 
 
80～95
 
30～40
48～62
40～54
75～85
48～62
Iodine Value mg/100mg
≤10
≤10
>10.0
≤18.0
>10.0
≤18.0
>18.0
≤38.0
>18.0
≤38.0
>46.0
≤60.0
≤10.0
＞46.0 ≤60.0
＞18.0 ≤38.0
＞18.0 ≤38.0
≤10.0
Hydrogenation Degree % 99 99 97 97 94 94 83 99
83
94
94
99

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