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PTFE DISPERSIONS. The big drawback to the ‘wonder plastic’ material—polytetrafluoroethylene—is its very high cost, and the very little that is at present being used in the U.K. appears in small moulded parts only. In massive form its use is quite impracticable. PTFE may, however, have applications as a dispersion in metal finishing work, a possibility that was considered by E. M. Elliott of I.C.I. Plastics Division when he presented a paper on this subject at the Conference of the Institute of Metal Finishing.