NBR

NBR 60, Black

NBR (acrylonitrile butadiene rubber)

Among standard seals such as O-rings and radial shaft seals, NBR is the most widely used material. The reasons for this are good mechanical properties, high abrasion resistance, low gas permeability and the high resistance to mineral oil based oils and greases. NBR is a copolymer of butadiene and acrylonitrile. Depending on the application, the content of acrylonitrile can vary between 18% and 50%. Low ACN content improves cold ﬂexibility at the expense of the resistance to oil and fuel. High ACN content improves the resistance to oil and fuel while reducing the cold ﬂexibility and increasing compression set. To obtain balanced properties, our standard NBR materials have an average ACN content around 30%.

NBR has good resistance to

mineral oil-based oils and greases
aliphatic hydrocarbons
vegetable and animal oils and fats
hydraulic oils H, H-L, H-LP
hydraulic ﬂuids HFA, HFB, HFC
silicone oils and silicone greases
water (max. 80°C)

NBR is not resistant to

fuels with high aromatic content
aromatic hydrocarbons
chlorinated hydrocarbons
non-polar solvents
hydraulic ﬂuid HFD
glycol-based brake ﬂ uids
ozone, weathering, ageing