... after-sales service O ring is one of the main products in our factory, it is made from Nitrile(NBR), HNBR ... on.We have O ring tooling 2000sets in house, our products conform to AS568,Metric, GB 245201.O ring detail for ... etc.Rubber moulding over 2000 setsWorker 150Staff25QC5Main productso rings, gaskets,custom rubber parts.Material Nitrile(NBR), HNBR, EPDM,Silicone, Fluorocarbon, SBR ...