Document 6B4BMGz0JxBMBvayEbVbbp3Km

FILE NAME DuPont DUP DATE 1972 Jan 16 DOC DUP086 DOCUMENT DESCRIPTION Letter to J.B. Armitage from Richard J. Hubiak Industrial Hygienist - RE Asbestos Incorporated Into Plastic Material im at ee See ee dad ad com aw CC B. K. Epstein - Plastics Experimental Station 323/210 ma 15 12 J. B. ARMITAGE PLASTICS DEPARTEENT EXPERIMENTAL STATION 323/321 ASBESTOS INCORPORATED ENTO PLASTIC MATERIAL INCORPORATED MATERIAL N. Epstein and J. F. Armitage Plastics Department Experimental stot^>mat th . A. '. ' L. V. d ca ca ca ant B J. Wbiak on June incorporating 1972 to discuss into polyesters and ~. are Da Post markets incurporating approximately while other naasmibfeascttousrerTshe intended use of asbestos in polyesters would be a new endeavor the flov through the mamsfuctring procedure vould be as follows: J02014 SS TT PP o4768 MBI Os 116978 The potential hezards are: 12) Adod f ti he an sbesg tos in with ths polymer pellets and silane. | Dustwould de genersted. This operatic: coud be carried out in a mixing unit with good local For larger batches a mixing unit with good local exhaust should be designed to control the dust The operater should war U.S. Buresu of Mines approved respiratory should U.S. U.S. Buresu U.S.B.X approval approval mmber 21-8 or bag to the ni The U.S.B.X approval mmber 21-8 or Constance suffice for U.S.B.X cf supplier supplier Miss Constance Eddy suggested having the supplier (tates Constance Eddy suggested suggested weighed in polym bags th this vay the bags could be could eliminate eliminate bags . 4 one w dung of it. Thicsould eliminate Tat of this one dung tay Adding the enclosed and exhausted exhausted exhausted There may extruder 2 This operation is enclosed and exhausted There may be some dusting on the initial adding of the mixture to the hopper If the present exhaust design does not contral this dust release respiratory protection of the type mentioned above should be required . 3 Pelletising of the polymer containing asbestos Duma ay t be gmarated at this step Presently there is no exhaust at this point but it will be added if neOSSERry It was mentiontehadt air samles may be taken at this locatiotno determinthee degree of dustiness There may be some loose fibers but the particles collected will more inhaled and deposited in the lung the asbestos fiberast the surface of the particle may cart their diasase probicing . mechanism mechanism suring suring snout control be this this - a release, the best means of dust control can be scccaplishel b) Chopping of waste plastic teri, , Sis is probably was made = that enclosures enclosures 8 are at the palletising operation The procedure for cleaning at chopper may require further consideration Dust my be chopper require require further further and require DUP 004769 102015 116979 . S) Release cf fibers from finished part. The intended use of these products as indicated in this fiberssentially fiberssentially fibersentialy fiberssentially & into the the end , the fiberssentially fiberssentially fiber bos undsine to n thetprioda uctlanl d ty he other products are not of other to the insulation where type, like trate-linings oF factors contribute release of fibers from the product If at some future datethe vas contemplated where it was possible for the fibers to be released into the atmosp a rheveier w e of the situation would be vertented If further questions arise or assistance is needed on the control of the dust at tha various operations, do not hesitate t al, ORIGINAL SIGNED BY RICHARD L. HUBLAK J. RICHAHUR BTD AK ~ INDUSTRIAL HYGIENTET RJE DUF 004770 J02016 116980