NBR o ring 1.Certificate: ISO9001:2008 2.Oil resistant, hard wearing,environmental 3.Different sizes Product NameNBR o ringCertificateISO9001:2008Country of OriginChinaAdvantagea.Ozone and chemical resistanceb.High temperature resistancec.Excellent weather resistanced.Anti-aging, anti-radiation, good flexibility, good elasticitye.Excellent resistance of acids, aliphatic hydrocarbons, aromatic ...