Document x51je57ZGgoGMkeoLmo8Q3VGy

uni NIV M* E. I. du Pont de Nemours 51 Company Haskell Laboratory for Toxicology ano Industrial Medicine Elkton Roao, Newark, Delaware 19711 CENTRAL RESEARCH AND DEVELOPMENT DEPARTMENT cc: G. L. Kennedy , CR&D, Haske H. J. Trochimowict, CRfcD, Haske C-SJ7 June 28, 1982 K. D. DASTUR CHEMICALS AND PIGMENTS DEPARTMENT B-6314 MAN-MADE MINERAL FIBERS VS. ASBESTOS Our literature-searching process shows that there is no consistent body of information which would .mandate a clear choice in selecting a risk-free fiber for insulation. At present, there is insufficient test information to permit such a selection. Unfortunately, there is no uni form consensus on the mechanism of fiber fibrosis and car cinogenesis. The long-term empirical tests which could support a provisional course of action have not been run. A summation of this state-of-the-art was attempted in the "World Symposium on Asbestos" held in Montreal beginning May 25, 1982. Some highlights are noted below. The provisional conclusion of this meeting suggests that all mineral fibers (natural or man-made) should be handled with great care. It is reasonable to foresee that all these fibers will be regulated and not prohibited. Conference Highlights The key-note speaker, G. Atherly (Canadian Centre for Occupational Health and Safety), emphasized that "a complex scientific question has been approached through less them adequate science and the whole has been conditioned by economic and political factors." y. E. van der Rest, Asbestos International Association, advocated controlled use of asbestos with an industry responsibility to ensure no socially un acceptable risk. (Including an international adoption of 2 fibers/cm^ limit). 8CTTCR THINGS FOR BETTCR LIVING . . . THROUGH CHEMISTRY DUP 0906827 SC-DP-07335