Document 2q2BwD6Gj6nkbxBgB65b9b0o5

Cleveland Chemical A. Vlttone N(-> Akron-/C020-I/5-H .4/6/66 The currently re commended maximum atmospheric concentration for vinyl chloride vapors for eight hour daily exposures is 500 ppm. However, the American Conference of Governmental Industrial Hygienists (the group that is primarily responsible for establishing MAC values) is proposing that, this level be reduced to 50 ppm. The basis for the reduction appears to be animal investigations that have been performed and publi.rued over the last several years, principally by bow Chemical Company. It is my feeling that the ACCIH proposal will be finally adopted raid vhen it is it will become a part of many State codes. I point this oat to you ns a forewarning of what ve may anticipate. It will mean, of course, that we perhaps will have to improve our controls, as for as atmospheric contamination is concerned, quite markedly-in our manufacturing plants. 1 understand from Canada that the Province of Ontario has already established the 50 ppm level as a maximum. cc: P.H. Lawrence W. Baughman W.E. McCormick 25139001 BFG63526