NBR – Acrylonitrile-Butadiene-Caoutchouc
NBR is an elastomer on the base of acrylonitrite-butadiene-caoutchouc which is used as budget-priced sealing material (e. g. O-rings for stopcocks). This material has a good resistance in mineral oils and fats and is also resistant to HFA, HFB and HFC-hydraulic fluids. It has a very good elasticity. PERBUNAN® (trade name of company BAYER AG) is not resistant to brake fluids on the base of glycol, HFD liquids, aromatic compounds (e. g. benzole), ester, ketone and amines as well as in concentrated acids and caustic solutions. That is why it is not the ideal material for the chemistry.