... 2.oil resistance,good sealing effects 3.many sizes,colors are available 4.according to FDA,ISO Viton rubber o ring:1 ... resistance,chemical resistance,eco-friendly,anti-static,anti-aging,excellent sealing effects,widely used,etc5.Medium:high concentration acid,alkai,air ... .Assurance:customized sizes,colors,hardness,etc1.Various materials such as:viton,silicone,EPDM,CR,NR,NBR,SBR,FPM,IR,HSN,chloroprene ...