Document Xzrpo1N7KrVyd1gV5y7n7o2xg

I July, 1969 Mr 3 H Lynch Department oi Health, Education and Welfare Public Health Service 1014 Bxoadwa/ Cincinnati Ohio 45202 Dear Mr Lynch, Thank you for your letter of June 13,1969, and for the copy of your Paper entitled 'Brake. Lining Decomposition Products* The last sentence in my summary of your conclusion?; was taken from the draft report which yon cent me in January, 1968, hut 1 see that your views hat now changed* X suggest, therefore, that the final part of try reference to your work should road a follows? "At lower hulk lining temperatures within the normal operating range, the hinder behind the surface remains intact. However, the spot temperature at the point of contact between the lining and the drum may he higher than the decomposition temperature of asbestos. The decomposition product* therefore, includes not free asbestos fibres hut a different mineral, resulting from thermal metamorphosis," 1 hope that this reference to your work is now acceptable to yon and unless I hoax' from yon to the contrary 1 will publish it in this forsm Yours sincerely, D P. Iiiekish Industrial Hygiene Specialist 8850 1/168 8006 1200 PRODUCED BY FORD