HNBR O-rings
Hydrogenated Nitrile (HNBR) O-rings
Hydrogenated Nitrile HNBR O-rings are made of a synthetic polymer that is obtained by saturating the hydrocarbon chains of Nitrile rubber with hydrogen. This special hydrogenation process reduces lots of double bonds in the main chain of the NBR polymer, so HNBR O-rings possess superior heat, ozone, chemical resistance and mechanical characteristics over standard Nitriles.
HNBR O-rings are resistant to mineral oil-based hydraulic fluids, animal and vegetable fats, diesel fuel, ozone, sour gas, dilute acids and bases. HNBR O-rings also resist new bio-oils (biological oils). HNBR is suitable for high dynamic loads and has a good abrasion resistance. HNBR are not compatible with Chlorinated hydrocarbons, Polar solvents (ketones, esters and ethers) and Strong acids.
Service Temperature of HNBR O-rings: For HNBR the Service Temperature is from -40 C to 150 C and some special compounds can handle up to 160 C.
Hardness of HNBR O-rings: 55 to 90 Shore A are available.
Color of HNBR O-rings: Black, green, blue, brown, rust and gray are available, or any Color we can design for you.
Application of the HNBR O-rings:
HNBR O-rings have wide application in the auto and oil industries. In old air conditioning and refrigeration equipment Chloroprene (CR) and Fluoroelastomer (FKM) are popular material with coolant system of HCFC (or CFC) and mineral oil.
However neoprene O-rings and FKM O-rings are not adequate in the newer coolant systems HFC134a (R134a) and PAG lube, because neoprene will degrade PAG lube and FKM / Viton will swell more in R134a, The available rubber option in this case are HNBR O-rings which are ideal for the above applications.
O-rings HNBR - 70 Shore A
O-rings HNBR - 70 Shore A The Hydrogenated Nitrile Butadiene Rubber (HNBR) O-ring has steadily increased in popularity over the last few years due to its excellent cost-performance balance and use in highly challenging applications such as automobile, high-performance industrial applications. The HNBR O-ring meets higher temperatures than the normal NBR. The HNBR O-ring has recently been designed to reach higher temperatures than the normal NBR while preserving tole..
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O-rings HNBR - 80 Shore A
O-rings HNBR - 80 Shore A The Hydrogenated Nitrile Butadiene Rubber (HNBR) O-ring has steadily increased in popularity over the last few years due to its excellent cost-performance balance and use in highly challenging applications such as automobile, high-performance industrial applications. The HNBR O-rings 80 Shore meets higher temperatures than the normal NBR. The HNBR O-rings 80 Shore have recently been designed to reach higher temperatures than the normal NBR ..
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O-rings HNBR - 90 Shore A
O-rings HNBR - 90 Shore A The 90 shore HNBR O-rings are excellently resistant to oils and chemicals. Obtained by the hydrogenation of the nitrile copolymer, the HNBR O-ring fills the void left between the NBR, EPDM and FKM elastomers where high-temperature pressures demand high tensile strength while retaining excellent tolerance to oils, freon and chemicals. The Hydrogenated Nitrile Butadiene Rubber (HNBR) O-ring has steadily increased in popularity over the last f..
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What are the primary advantages of using HNBR O-rings compared to standard NBR O-rings?
HNBR O-rings offer several advantages over standard NBR O-rings, including improved resistance to heat, ozone, and various chemicals. This makes them particularly suitable for applications involving exposure to aggressive media and high temperatures. Additionally, HNBR O-rings maintain better mechanical properties and tensile strength, enhancing their durability and longevity in demanding environments.
How do I determine the appropriate hardness for HNBR O-rings in my application?
The hardness of HNBR O-rings is typically measured on the Shore A scale, with options available such as 70 Shore A, 80 Shore A, and 90 Shore A. The choice of hardness depends on the specific application requirements, including the pressure, temperature, and fluid compatibility. Generally, a softer O-ring provides better sealing at lower pressures, while a harder O-ring is more suitable for high-pressure applications.
What factors should be considered when installing HNBR O-rings to ensure optimal performance?
When installing HNBR O-rings, it is critical to consider factors such as the groove design, compression set, and environmental conditions. Ensure that the groove dimensions are compatible with the O-ring size to prevent extrusion or deformation. Additionally, proper lubrication can help reduce friction during installation, while avoiding harsh solvents that may degrade the O-ring material. Furthermore, it is essential to consider the service temperature and pressure to ensure optimal sealing performance.