Document OJkRQ1910Bw2O0q4jGBQ8Ogqe

Dr. C. U. Deraehl New York Office 31 March 1969 Mr. N. H. Ketcham Technical Center Safety Precautions Asbestos Fibers Dear Carl: / The attached letters are self-explanatory. As you can see I have advised Texas City people to contact us rather than the government. I thought perhaps one of you might wish to contact the other recipient's of Mr. Bonin's letter in this regard. Cordially, R. E. Joyner,M.O./eb Ends. UCCTXC 06805 V- 1 i v7 / , " UC.' r< i-l UNION CARBIDE CORPORATION Consumer Products Division Quality & Specifications P. 0; Box 6056 ' Cleveland, Ohio 44101 March 18, 1969 0 O* , T'V y o ^ c.C 7-tt \ C* L-(, ^>"1 y & In, >--' T<.c^ cSt. . Messrs. W. T. Barker - So. Charleston W. W. Bedford - Torrance G. P. Borst - New York L. W.. Bract - So..Charleston G. 0. Bunch - Whiting W. G. Cornell - Wf&einz J. D. Enrighc^Xwhiting J. E. Finch-'*^ Texas City A. D. Haddix - So. Charleston. W. G. Hennessey - Cleveland W. E. Knight - Torrance J. McMaster - Carteret R. E. Merrill - Torrance E. M. Morgan -- New York B. W. Pratt - Texas City W. O.. Price - Carteret W. J. Suiter . - Texas City C. J. Van Eman - Texas City - Subject: Safety Precautions Asbestos Fibres Recently one of the canning locations asked,if any safety precautions are needed when handling Asbestos Fibres. We wrote Johns-Manville for this " information and the following Is a direct quote from their letter of March 11, 1969: "Regarding safety precautions needed when handling Asbestos Fibres, let me quote extracts from letters written by Johns-Manville Environmental Control Dept.:"- '"Respirators for protection against fiber dusts should be Bureau of Mines approved for protection against toxic dusts, not significantly more toxic than lead (Bureau of Mines Schedule 21A or 21B). Our own plant people seem to prefer MSA DUSTFOE 77. Other manu facturers of approved respirators include American Optical and Willson.1" "'I understand that your company wishes to take every precaution to insure the safety of your workers engaged in the fabrication of materials contain ing asbestos. The best precaution is mechanical dust control equipment designed to Main tain the airborne concentration of asbestos fibers below the Threshold Limit Value established by the American Conference of Governmental Industrial Hygienists. This group establishes TLV's for airborne concentrations of different toxic substances which- represent conditions under which it is believed that nearly all workers may be repeatedly exposed, day after day, without adverse effect. The newly proposed TLV for asbestos fiber is two million paricles per cubic foot (2 MPPCF) or twelve -fibers per cc (12 f/cc). . \ UCCTXC 06806 List Sub: ' Safety Precautions - Asbestos Fibres 2- 3-18-69 Asbestos fiber dust concentrations are measured in accordance with techniques established by the United States Public Health Service. The determination of MPPCF requires collection of samples by an impinger and a subsequent particle count under a 100 power light microscope. The f/c count is determined by membrane filter coupling and subsequent' fiber count under a 430 power light microscope I TThese techniques are described in detail in literature available for the U.S.P.H.S. If additional information as to sampling.and analysis is required, it can be obtained from: Mr. Howard Ayer Chief Environmental Activities Field Studies Occupational Health Program Dept, of Health, Education & Welfare 1014 Broadway Cincinnati, Ohio 45202 A competent, experienced dust control engineer should be employed by your concern' to design the dust control system, including the hoods, duct work, fan and collector. It is essential that your dust control system employ a high efficiency dust collector to prevent external atmospheric dust con tamination. V1 *. PGB/nur P. G. Bonin UCCTXC 06807