1.SGS,ISO,for different machines 2.SR,EPDM,SBR,CR ... liquid material,mineral oil,lubricant and other different environment2.materia:SR,NBR,EPDM,NR,SBR3. ... different sizes available6.packing;standard packing(inner:poly bag outer:carton) or customerizedcertification:ISO9001 ,SGSwe are looking forware for ... cooperation,make sure good quality rubber material for production3.SGS,ISO certificate,make the test ...