HNBR Rubber - Hydrated Nitrile Butadiene Rubber

HNBR stands for Hydrogenated Acrylonitrile Butadiene Rubber. It is a copolymer of acrylonitrile and butadiene. From a chemical point of view, the reaction involves complete or partial hydrogenation of the butadiene component at double bonds. Through peroxide crosslinking, the material gains temperature and oxidation stability. It is a highly durable and abrasion-resistant material.

What is hydrogenated nitrile rubber (HNBR)?

Hydrogenated nitrile rubber is an extension of HNBR abbreviation. It is a very durable rubber that exhibits greater resistance to media than NBR. It is a blend of synthetic rubbers designed to work under higher temperature conditions than standard rubbers. Additionally, it was important for it to maintain resistance to oils and mineral greases.

HNBR rubber is a very durable material. It performs excellently in high-temperature conditions. Production plants appreciate it for being highly resistant to wear and any mechanical damage. The rubber is very resilient.

HNBR - Temperature Range

Depending on the composition obtained in the production process, it performs well in extreme temperature conditions ranging from -30 to 150 degrees Celsius. The rubber structure does not react in the presence of mineral oils and greases, as well as plant and animal fats (note - in the presence of organically derived fats, it is temporarily resistant up to 170 degrees Celsius). The rubber is also unaffected by ozone and diesel fuels. It is also resistant to aliphatic hydrocarbons such as gasoline, propane-butane compounds. HNBR excels in environments with diluted acids, bases, and salts. This includes situations where these environments are accompanied by elevated temperatures, acidic gases, or glycol mixtures. The elevated temperature mentioned is precisely 150 degrees Celsius. Occasionally, HNBR can withstand temperatures of up to 190 degrees Celsius. Interestingly, this rubber does not exhibit direct resistance to water, engine oils, and lubricants that contain corrosion inhibitor additives. In a watery environment, the rubber performs well up to 149 degrees Celsius. It also shows weak resistance to fuels with high aromatic compound contents such as gasoline, alcohol mixtures, ketones, esters, and ethers. HBNR is resistant to hydraulic fluids of types HFA, HFB, HCF.

HNBR elastomers have emerged relatively recently, with their main purpose being to enhance the mechanical properties and oil resistance of NBR rubbers. It could be said that HNBR fills a market gap between NBR O-rings and those made of EPDM and FKM. This rubber is suitable for producing various seals in environments where work is done at high temperatures, under pressure, and where there is a high risk of damage. An example product made using HNBR is air compressor seals in compressors. It can also be used to manufacture fuel hose components.