HNBR O-rings are an upgraded version of NBR o-rings. They maintain the characteristics of NBR o-rings, and at the same time, they are more excellent in heat resistance, oil resistance, and weather resistance.
HNBR or HSN is short for Hydrogenated nitrile rubber and is a rubber obtained by hydrogenating the carbon-carbon double bonds in the molecular chain of nitrile rubber, so it is also called highly saturated nitrile rubber.
HNBR o-rings are not as widely used as NBR O-rings or Viton O-rings, but they are a necessary choice in some applications. Their price is higher than NBR o-rings but lower than the Viton o-rings.
- Material: HNBR / HSN / Hydrogenated Nitrile
- Temperature Range / Rating: -40 °C (-40 °F) to 150°C (302 °F)
- Low Operating Temperature Limit: -40 °C (-40 °F)
- High Operating Temperature Limit: 150°C (302 °F)
- Durometer Hardness Range: Shore A 40-90
- Standard Durometer Hardness: Shore A 70
- Color: Black (standard), custom color is available
- Outline: Round, square, rectangular, custom
- Cross Section Shape: Round
- Cross Section Width (CS): 0.5 to 20 mm (0.020 to 0.787 inch)
- Inside Diameter (ID): 0.7 to 2965 mm (0.028 to 116.732 inch)
- Standard Size: AS 568, BS 1806, ISO 3601, DIN 3771, JIS B 2401
- Shelf Life: 5 – 10 years
- Cost Level: High
HNBR o-rings are one of the rubber seals with excellent comprehensive performance. Compared with nitrile o-rings, HNBR o-rings have better abrasion resistance, corrosion resistance, tensile resistance, tear resistance, and compression distortion. They have good compatibility to fuel, ozone, sunlight, and other atmospheric conditions, but it is not recommended to be used in alcohols, esters, gasoline, or aromatic solutions.
Chemical Resistance Properties
HNBR o-rings are commonly used in the air conditioning and refrigeration industry and are widely used as seals in the environmentally friendly refrigerant R134a system and automotive engine system seals.
With the development of the automobile and petroleum industry, oil drilling requires rubber products to withstand the test of high temperature, high pressure, acid, amine, H2S, C2, C4, and other steam. HNBR o-rings can resist acid, oil, and solvents and also have good heat resistance, high-temperature resistance, high-pressure resistance, and oxygen resistance.
HNBR rubber can be made into o-rings, gaskets, shock absorbers, and seals which can be used in the petroleum industry and the automotive industry. The heat resistance and radiation resistance of HNBR rubber material are better than that of silicone rubber, Viton rubber, and PTFE rubber, so it is suitable for various rubber sealing rings in power stations, as well as hydraulic pipes, hydraulic sealing rings, and cable protection for power stations, sleeves, and seals.