Document 99r9ZEDxgK5ayZwK8XD97xev5

Intra Company / PLAINTIFF'S BXHiniT FD-252 January 28, 1970 Professor Irvine J. Selikeff, K, D. Mount Sinai School of Kedloine of the City University of few lork 5th Avanuo and 100 Street Bov fork, Bov fork 10029 Door Professor Sellkoffi I havo been asked to assess the importance of brake lining material as an air pollutant. Most of tha concern has to do with the asbestos which comprises something like one-half of the lining material. I an aware of the paper by Jeremiah R. lynch, J. Hr Poll. Control Assoc. 1&, 824 (1968) Which purports to show that the asbestos undergoes a metamorphosis to a mineral of differant structure, but 1 understand that you have Misgivings about the assumption that all asbestos fiber* are large enough to bo seen at the magnification used in lynch* paper. Another point, it soetas to mo, is whether the metamorphosis renders the material loss malignant as far as physiological action is concerned, but as far as I know there is no information about this. What do you think about this slutation? Do you know of any evidence that tho material abraded from brakes is any different in its effect co the lungs than the material stirred up in the building trades? Maybe we should consider running aone experiments to determine si203 of asbestos fibers as found in the undamaged lining material, or perhaps repeat Lynch's work with the far higher magnification available to us. I cd33cd yv-r r here. As you pret"..>ly know, it made quite an impact on those who voire present. The following day when I returned to the lab, everybody was telling me. About the talk so 1 suppose 1 could eay that 1 did hear it transcribed. One of the points I understand to have been made (I think I bad hoard It first from Dr. Veinstook when he came back from a Gordon Conference last year) i 8000 0032 Sl.lo177 PRODUCED BY FORD v.jy-X:> Intra Company - 2 January 28, 1970 is that the gross amount of asbestos used In brake lining is mch smaller than the amount that Is wasted in the building trades. 1 Vould like to know moro about thl3, that is, how this conclusion was reached (what the mmabors were and where they came fron, and so forth). Anything you can do that would help me form an informed opinion on 11^ ..ubjoct of bakes wsuld bo much appreciated. I hope to hoar from you soon. Sincerely youra , VHP me William It. Piwon Chemistry Department Scientific Research Staff fiGOO 0033 177B ' PRODUCED BY FORD