HNBR Mechanical O Ring Cord Professional Silicone Oil / Greases Resistance Metric O-Ring Cord, can be used to make custom sizes. Can be "cold bonded" or "heat spliced and vulcanized" We stock the most popular "Buna-70" and "FKM-70" materials Peculiarity Of O Ring Cord: 1) NBR O Ring Cord: Good chemical resistance to mineral oils and greases,hydraulic oils H, HL, HLP, non-inflammable hydraulic pressure fluids HFA, HFB, HFC to approx. +50C and water to max