HNBR Rubber

HNBR (Hydrogenated Nitrile Butadiene Rubber), also known as Highly Saturated Nitrile (“HSN”), is a special class of nitrile rubber (NBR) that has been hydrogenated to increase the saturation of the butadiene segment of the carbon polymer backbone. Subsequent improvements to the material properties, over that of nitrile rubber (NBR), include greater thermal stability, broader chemical resistance, and greater tensile strength. Nevertheless, HNBR is still a type of hydrocarbon rubber and should not be expected to deliver the chemical resistance or thermal stability of a fluoro-rubber.

HNBR rubber has better oil and chemical resistance than nitrile rubbers and can also withstand much higher temperatures. Like NBR rubber, this type of elastomer has excellent resistance to oils and fuels but it also has excellent resistance to many chemicals, heat (steam / hot water), and ozone. The mechanical properties like tensile and tear strength, elongation, and abrasion resistance are also excellent. Furthermore, HNBR rubber has good dynamic behavior at elevated temperatures.


HNBR Rubber

Chemical Resistance:

  • Aliphatic hydrocarbons (propane, butane, petroleum oil, mineral oil and grease, diesel fuel, fuel oils) vegetable and mineral oils, and greases
  • Silicone Oils
  • Automatic Transmission Fluid
  • Automotive refrigerants
  • HFA, HFB, and HFC fluids
  • Dilute acids, alkali, and salt solutions at low temperatures


Its strength is above all in demand for rod and piston seals, along with O-rings, radial shaft seal rings, boots, and diaphragms. Especially in the processing industry, HNBR rubber offers wide-ranging opportunities for use. In the process industry, for example, HNBR is superbly suited as a material for butterfly valve seals. HNBR rubber is an excellent solution for dairies, the beverage industry, and applications.


HNBR radial shaft seal ring

CUSCOR can provide you with a variety of HNBR rubber products.