... rubber silicone o ring 1.water, oil resistance, anti-aging 2.silicone,rubber material 2.FDA,ROHS,SGS Certificate Factory history8 yearsFactory area3700m2CertificateSGS, ROHSMachines(20sets)Rubber ... 150Staff25QC5Main productso rings, gaskets,custom rubber parts.Material Nitrile(NBR), HNBR, EPDM,Silicone, Fluorocarbon, SBR, Neoprene(CR), ... Please feel free contact with us silicone rubber o-ring