... .many sizes,colors are available 4.according to FDA,ISO Viton rubber o ring:1.Working temperature range:-50~+300°C2 ... ,colors,hardness,etc1.Various materials such as:viton,silicone,EPDM,CR,NR,NBR,SBR,FPM,IR,HSN,chloroprene,etc are available.We ... ,according to your partone4.Sizes:customized,standard or nonstandard Colorful viton rubber o ring