Document vBz5pv00Eqb9ZQbJyJRbLbg36

FILE NAME Manville JMA DATE 1969-1970 DOC JMA256 DOCUMENT DESCRIPTION Memos RE Asbestos Product Labeling '~ ARpersielar2ch3 & 1E9 ng7 in0 eeriSe ng Center , | , ae oo ae oa notice Per my phone conversationwith you today this is the notice .. which appears on ourour asbestos fiberbags eas in 3/8Cautionlet erlingettering | y This bag contains chrysotile asbestos fiber Persons exposed - to this material should use adequate halation of this material over long periods The is in above inlettering 16 2 protective may . devices as in- be harmful ts ae ee a or F. W. Matthews GHQ March 12 1969 Asbestos Paper and Millboard Labeling Inhalation of excessive concentrations of asbestos dust over a long period of time can result in pulmonary injury Every effort should therefore be made to protect people from this risk It is my opinion that Millboard could present a problem in conjunction with handling cutting and fabricating This opinion is based on observation of our M gasket operations I recommend consideration for a caution label on Millboard Asbestos Paper does not present the same problem as Millboard The fibre is bonded into the paper and does not appear to become airborne The only dust generated from use of paper that I have observed in M is during the slitting operation This has not been extensive I do not recommend consideration for a caution label on Asbestos Paper at this time Labeling combined vironmental Control E. M. Fenner and H. Industrial Relations En- and Legal By copy of this M. Ball to provide you with letter I am requesting their opinions If it is agreed that either of these products should be labeled we will be glad to provide assistance in conjunction with the wording Also we wish to review the final version before making labeling effective CLS mw CC M. W. Burleson H. M. Ball E. M. Fenner = Finderne CLE C. L. SHECKLER Wivam Wivam Wivam Wivam December 16EngineerinEngigering Center H. E. Konrad - DH RECEIVED RECEIVED DEC DEC 23 1970 19/0 WEBER H. E. KONRAD HEATING OF AMOSITE When amosite fiber is heated to 700 to 1400F they are converted tt eompea ramtautrereisalin catlhleedrange of oxyamosite than the This form of amosite is more brittle and friable fibrous unheated material It still however retains its morphology There is no medical evidence available activity of oxyamosite on the biological evidenc knowledge must assume that With With being our present state of munescstary and fibir t alo so u muss t be ExtenExsteinsvivee expensive animal studies considered necessary to truly establish the would be heated to temperatures in biological activity When excess of 1400 the amosite is converted to other minerals longer have the spinel and hematite which no fibrous shape any ability to reinforce the They also would no longer have nontoxic product but could be considered ee fe P. Leineweber JPL CC S. Speil W. K. Hesse