... O ring is one of the main products in our factory, it is made from Nitrile(NBR), HNBR ,EPDM ... -solvent resistance and so on.More about us : Factory history8 yearsFactory area3700m2CertificateISO/TS16949Manufacturing Machines(20sets)Rubber mixer, Automatic ... Rubber moulding over 2000 setsWorker 150Staff25QC5Main productso rings, gaskets,custom rubber parts.Material Nitrile(NBR), HNBR, EPDM,Silicone, ...