... synthetic composite PTFE yarn, the yarn is sintered, highly stretched. The packing is then re-impregnated with mix of PTFE ... It has 2 kinds of tapes, one is with oil, and another one is without oil.DONGFENG White PTFE PackingProduct FeatureClean, non-contaminating ... valves, plunger pumps, agitators, mixer etc. And where contamination is not permitted To get further information, pls visit our website ...