Jun 27,2024 by DAWN
HNBR: A Saturated Elastomer with Superior Substitutability
HNBR is a highly saturated elastomer that maintains the oil resistance and wear resistance of nitrile rubber while also exhibiting excellent thermal-oxidative aging performance, ozone resistance, radiation resistance, chemical corrosion resistance (including resistance to hydrogen sulfide), and good dynamic properties. This article primarily introduces the substitutability of HNBR, helping everyone to better understand HNBR.
HNBR&NBR
When NBR is used at temperatures exceeding 120°C, the double bonds on the butadiene chain in the main chain are attacked by oxygen, leading to chain breakage. This causes NBR to prematurely lose its high elasticity and functional performance. Compared to NBR, HNBR has better heat resistance, higher tensile strength, and can withstand low temperatures down to -50°C.
For example, in the application of automotive parts, NBR performs poorly in ozone and radiation resistance when exposed to acidic gasoline and high temperatures of 150°C over the long term, making it inadequate for sealing engine components in vehicles. In contrast, HNBR can regularly withstand temperatures up to 150°C and boasts superior tensile strength and aging resistance. Therefore, gear box seals, shock absorber oil seals, and power steering oil seals, which were previously made using NBR, have gradually been replaced with HNBR.
HNBR&FKM
Due to environmental protection requirements, automotive fuels often contain various additives such as methanol, ethanol, methyl tert-butyl ether, amine corrosion inhibitors, and anti-wear agents. As a result, rubber components that come into contact with fuel need to possess superior performance characteristics.
Both HNBR and FKM exhibit excellent resistance to fuel oil, corrosive media, and low permeability to media. Compared to FKM, HNBR has higher tensile strength, superior resistance to chemically corrosive media, and better cold resistance.
For example, in the application of seals and other products in the automotive manufacturing field, HNBR can achieve a good balance between fuel resistance and low-temperature performance. Its overall performance surpasses that of FKM.
HNBR&CR
Both CR and HNBR have good oil resistance, high physical and mechanical properties. However, for manufacturing rubber components like timing belts used in dynamic stress environments, HNBR has significant advantages, especially when applied in high-temperature conditions and for prolonged use.
Under dynamic stress, HNBR maintains high physical and mechanical properties after long-term high-temperature aging. It exhibits minimal dynamic permanent deformation and small changes in elongation and hardness. In contrast, under the same conditions, CR often deteriorates and loses its usability.
Conclusion
In summary, HNBR offers excellent substitutability, capable of replacing NBR, FKM, and CR, thereby enhancing your product's performance.
Dawn has established a 3000-ton/year HNBR production facility, with mature production conditions and high-quality products that have been successfully exported to countries such as South Korea and Italy. Dawn HNBR can be widely applied in industries such as aerospace, automotive, oil drilling, machinery manufacturing, and textile printing.
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