Document dY5JDDNgMvRxJQGzJZbnqRBZq

FILE NAME: CertainTeed (CERT) DATE: 1968 Jan 22 DOC#: CERT004 DOCUMENT DESCRIPTION: Letter from CERT to US Public Health Service Certain-teed Products Corporation pipe division P. 0. Box 113 Ambler Pennsylvania January 22, 1968 Dr. Herbert E. Stokinger U. S. Public Health Service 101U Broadway Cincinnati, Ohio U$202 Dear Doctor Stokinger: I have been Industrial Hygiene Engineer with my company for 8 years and have practiced this profession since 19U7. I received a 1968 Notice of Intent of the Committee on Threshold Limits of the A.C.G.I.H. from Mr. Clayton, A.I.H.A. Secretary, and I wish to comment on your proposal concerning Crocidilite, a form of . asbestos. I strongly object to the point of view that, "Since no safe limit can be established for this form of asbestos at this time, etc.-- it is recommended that workers exposed to Crocidilite be equipped with air supplied helmets". If this opinion is based on Wagner's and Selikoff's studies on South Africa and the United States insulation workers, I believe it is not sufficient evidence to virtually assign a T.L.V. of 0 when more hazardous materials have been handled by well designed exhaust systems similar to those used in our industry. The experience of our industry, which uses a relatively small per centage of Crocidilite, does not reflect such conclusions as you probably know since the U.S. Public Health Service has been investi gating our industry for over two years. They have rarely found dust counts higher than 2.5 rampcfa throughout the industry. In view of the reluctance of the U.S. Public Health Service to promulgate the medical portion of their study of the asbestos industry, since the medical experts are undecided how to approach this aspect of the study, I would think that your committee would hesitate to come up with a proposal such as you have. I understand that your committee will meet early in February to discuss T.L.V.s and that industrial representatives are invited. You may have material to document your point of view, of which I am not aware. v J rr ' U1 ! ; - Castleman.CERT000011 Dr. Herbert E. Stokinger -2- January 22, 1968 Since I am attending the U.S. Public Health Service seminar on respirators in Cincinnati on February 6, 1968, would you let me know if I can also attend the A.C.G.I.H, discussion on Crocidilite. Please send me dates and agenda if you can invite me. Sincerely, LHcb 0. Leon D. Horowitz Industrial Hygiene Engineer Castleman.CERT000012