1.SGS,ISO,for different machines 2.SR,EPDM,SBR,CR,NBR,FPM etc. ... ) or customerizedcertification:ISO9001 ,SGSwe are looking forware for your visit to our factory. Rubber seal/gasketMaterialEPDM,NBR,SR,SBR,NR,CRFeatureEcofriendly,UV ... .Stable rubber material cooperation,make sure good quality rubber material for production3.SGS,ISO certificate,make the test at a regular ...