1. ROHS,ISO 2. NBR,EPDM,SR,CR,SBR,FPM etc. 3. UV,FR,oil/ageing/ozone/shock proof,size:50-630 O RINGdurable in liquid material,mineral oil,lubricant and other different environmentmateria:SR,NBR,EPDM,NR,SBRcolor:available in any color,according to customer's requirementworking pressure:<= -35--200 centigradespecification:standard and non standard available,different sizes availablepacking;standard ...