Document JJrwbxzyEO3LbemZ3qYaoR8GZ

FILE NAME Manville JMA DATE 1969 Nov 14 DOC JMA161 DOCUMENT DESCRIPTION Letter from Manville to Delta MANVILLE RESEARCH& ENGINEERING CENTER O. BOX 139 MANVILE N. 08835 2 TELEPHONE 722-9000 AREA CODE 201 . M M es M 196 November 14 1969 : 5 Mr. b P. Hetterwarn Assistent Vice President - Enginearing Delta Airlines Inc. Atlanta Airport Atlanta Atlanta Georgia 30320 . Dear Mr. Matter Rovember 5 1969 to ou Mr. John Hauenstein has been referred Before answering the questions in your letter I will set forth some background information that I think will be helpful The American Conference of Governmental Industrial Hygienists establishes Chrebhold Limit Valons for hazardous materials Threshold Limit Valuns refer airborne concentrations of substances and represent conditions under which to believed that nearly all workers may be repeatedly exposed day after without adverse effect They are weighted concentrations for au day and a 40 concentrationdse 2 hour waek The intended TLV for million particles per cubic foot exbestos fibar dust of air in the workplace The two asbestos cloth mentioned in your letter are woven from yarns made from asbestos and rayon fibers The 14325 cloth has brass wire inserted for ac itional strength Both clotha have a latex surface coating to reduce dusting Now in answer to your specific questions 3 No toxic vapors will be generated during your hast treating operation from theas asbeston cloths consider it highly unlikely that any use you make generate aufficient airborne asbestos fiber dust to Limit Value of the exceed cloths could could the Threshold 2 It is difficult for me to recommend shop procedures from the information I have I don't know whether you cut or sew the cloth and I don't know how it is used in your heat treating operation D. P. Hattermann November 14 1969 3 I doubt that your processing or handling of asbestos cloth constitutes a aies safety hazard However there are Manville products that might be ~ubstituted I muggent you contact our Industrial Insulations Division . Sales Office in Atlanta Err on Please call me if you have additional questions and we can discuss them k bs oa the phone Vary truly yours Edmund I'mI'm Jenner . Edmund M. Fenner Director Environmental Control eet H. M. Bali = GHQ ' W. P. Raines CHQ W. J. Alfriend Jr. - Atlanta H. P. Templeman Atlanta . J. A. Hauenstein - Atlanta