1.SGS,ISO,for different machines 2.SR,EPDM,SBR,CR,NBR, ... /gasketMaterialEPDM,NBR,SR,SBR,NR,CRFeatureEcofriendly,UV,FR,water/oil/abrasion resistance etc.sizeAs your drawing or sampleUsageAuto,equipment,machine,industry,ship ... material cooperation,make sure good quality rubber material for production3.SGS,ISO certificate,make the test at a regular time4.Over ...