... shaped like a doughnut. When pressed between two mating surfaces, O-rings seal block the passage of liquids or gases.2 ... according to clients' requirement. Benefit:We manufacture high performance rubber o-rings that are available in a variety of materials, in ... , NR, SBR, EPDM, FKM, IIR, BR etc.. Performance for rubber o ring:Durable in liquid material, mineral oil and lubricantGood resistance ...