Document bayX92bLGDwbr1V9V0d2N6qQ6

SO UP r\i-< ^ i r.w * w RECORD OF CONTACT D<r.. J^ie^l^S. Plae. r pv . I. duPant dslieasuru and Co., s^r*erias De?t* ^ Kilniagton, Delaware jCT_____ Asbestos............................. . PLAINTIFFS EXHIBIT ! ACS-53 _Dust Control . esfltai*vv IC# iCCl^CT PositiM JhYicioa Safety fivB-rtrtcadc:: C# .livia^ton^ ... ______________ A. Svahs ________________________ ___ACSS _____ _, __AC53* Vtlalngtoa s. King . fr.ishnail This visit vac mac to discuss the resent restrictions placed on the uac of asbestos containing products by duPont at their contract sites Shu attached letter dated Hey 2 provides the essence of these restrietlecc. Jtmjrcjt 2 under the suction headed Ataospheric Dust Contrul_oo page 2 providel the impetus fer this visit since It in effect prohibits the use of Armsemy 'on any duPont project. Keeper described the background leading up to the isomnee of his thy 2 letter as beginning in the Fall sf 1966* At that tlae a program of cocitorlrg' pc rsoruiui erasure to ist froo insulaticg catcrisis was instituted at scvurtil of tuuir contract sites* The monitoring voj achieved by affl;clC a battery operate! unit to insulation workers and having then vuar it throu^iout the vorlsLag day. This unit drew a nensured amount of dust eon* talning air thruu^i a filter which collected the dust* later, the ealluctlon on the filter was analysed using phase microscopy techniques to provide a reading of asbestos fiber content belov 5 kicross in length, asbestos fiber content abuve 5 microns In length ani total dust contest. This lnforcatlon scs correlated vith the health of the workers monitored and froo this the conclusion vss reached tmt the threshbold licit value for asbestos fibers lues than 5 Jiicroa- in length should be act at 500,000 particles per cubic foot of air. Uo doubt, it vis learned during this nonlt.jrins progra.# tint such a limit could be feasibly obtained during the handling of block am pipe covering entertain, but'sprayed materials ccr>*-- cted coriiiueruhly sore than talu to the extent that it was dueoud bsrai\fl ilcnco the prohibition a xlnct pcvwr spraying of asbestos containing cmtcrlul*. |* ^ -- 4.11 {|"7S