... .Usage:sealing parts 3.Certificate:ISO 9001 TS16949,RoHS. 4.Rubber O-ring seal:NBR CR SBR E O ring seal ... colours according to clients' requirement. Benefit:We manufacture high performance rubber o-rings that are available in a variety of materials ... , NBR, CR, NR, SBR, EPDM, FKM, IIR, BR etc.. Performance for rubber o ring:Durable in liquid material, mineral oil and lubricantGood ...