Document XzBvKJGpB66y1Rm9dnN01dprR

FILE NAME Manville JMA DATE 1971 June 29 DOC JMA003 DOCUMENT DESCRIPTION Letter - Alcoa Marinite Hazards 15175 Pi a Environmental Control Department Research & Engineering Center June 29 1971 G. E. Grimshaw - Pittsburgh Dist Off CC R. C. Wyllie - Mvl H. E. Konrad - DHQ A. G. Reinker - Pittsburgh File C ALCOA - PITTSBURGH PA MOLTEN METAL MARINITE Bob Wyllie has asked that I reply to your letter of June 18 addressed to H. E. Konrad In the last paragraph of physical changes in operation that is part MARINITE To the best change in the fiber to of your letter you discuss the possibility the asbestos fiber during the heat treating of the manufacturing process for MOLTEN METAL of our knowledge there is not sufficient modify the potential health hazard It is Manville's practice to equip all of the dust creating devices used in the fabrication of MARINITE with properly designed dust control systems We prepared by the Committee use the manual Industrial Ventilation on Industrial Ventilation of the American Conference of Governmental Industrial Hygienists as a guide in designing these systems This manual costs 4.00 per single copy and may be obtained by writing to Secretary American Conference of Governmental 1014 Broadway Cincinnati Ohio 45202 Industrial Hygienists The objective of the dust control system is to maintain the dust concentrations in the workplace below the Threshold Limit Value Industrial Hygiene Surveys utilizing the membrane personal air sampler technique recommended by the United States Public Health Service can determine if this objective has been met for asbestos fiber dust Alcoa has an active industrial hygiene department under the direction of Dr. Lester V. Cralley I believe has the ability to perform this survey that 7 I enclose for your information and use the following booklets 1 Recommended Health Safety Practices for Handling and Asbestos Applying Thermal Insulation Products Containing Asociation prepared by the National Insulation Manufacturers Association G. E. Grimshaw- Page 2 June 29 1971 Pittsburgh 2 Recommended Practices for Fabricating Handling and Applying Asbestos Products in the Building and Construction Industries prepared by the Health & Safety Council - Asbestos Cement Products Association 3 Asbestos Health Precautions in Industry prepared by the Department of Employment and Productivity in Great Britain 4 Recommended Safety Practices for Handling Asbestos Fiber prepared by Manvill~ S. A. Tompkins is preparing a new set of specifically to the control of dust when JOINER PANELS The same standards would of MOLTEN METAL MARINITE OEM data pages referring fabricating M MARINE apply to the fabrication In the postscript to your letter you mention the range of dust particle size We have never measured this but believe that much of the particulate and fibrous dust ranges from .5 to 5 microns in diameter Ei Ei E. M. Fenner Encs 4 ki