... 1.Silicone FKM FPM VITON A VITON B GF GFLT GLT AFLAS HNBR... 2.High price performance ratio 3.OEM&ODM: YES ... nameFlat o ring MaterialSilicone,,FKM,FPM,VITON A, VITON B, GF,GFLT,GLT,AFLAS,HNBR... ColorRed, blue, pink,white, black, ... oil resistant rubber, good radiation resistance and high vacuum resistance. 2.Good electrical insulation, mechanical properties, chemical corrosion resistance, ozone ...