Document VjwREmLOewxokeDk8krL645RK

* v uL* 4* April II, 1969 John 9. Calvin, Isq. heua, Tutam t Kenan 940 Ota Moines luildlng Saa Moines, leva 50309 Otar Mr. Calvin; This will reply ta your laetar of April 10, 1969 concerning Cha elaia of "asbestosls" nade by aa employee af tba L. L. laaulaclorn and Simply Co. Aa Z an aura you ara avara, to contract Cha dlaaaaa "asbestosls" ana nust, in soon nannar, km m exposure fox a prolonged parlod af tiaa Co aabaacaa flbara or particles. You lndleaca Chat Cha claimant oorkad with our self-sealing lap jacket plpa insulation, which produce doaa not eoncaln any aabaacoa flbara. Me doubt tha Job racorda of L. L. Znaulaclon can aubacandaca whether or not Cha claimant handlad or appllad agbestoscontaining producta during hla employment vlth It. Zf, aa you acata. ho handlad only producta containing glass flbara, ha uould not hovo contractad aabaacoala frou auch exposure. 7harafora, tha answer to your first quaaclon on page 2 of your lattar would bo In cha negative. Zn regard Co tha aggravation of a axlacing lung condition, thorn arc savural Inportane cons Ida rational (1) tha alaa of cha air-borne dust pardelaa, (2) tha quantity of tha dust, (3) cha laagth of exposure Clan. Unlike coal and allien or asbestos dusts, neat alr-borna fibrous glass pardelaa (dusts) ara too large to eater tha lungs. Zf glass dust does not enter the lungs, it cannot aggravate a lung dlaaaaa. therefore, the answer to your second qua aden would also bo la tha negative. With respect to your third question, nodical research studies ad investlgatlona, aa wall aa long-tins experience, hovo dannnacrated that exposure to air-borne fibrous glass pardelaa doaa not constitute a health haaard. Fibrous glass has bean shown to bo biologically laert. Copies of reports of nedlcal studies by nationally recognised research physicians are enclosed. Those reports should be sufficient to support the position that flbroua glaaa does not cause asbastosls nor does It cause a lung disease. Ihaiaoconlasas, such aa asbastosls and sllleoels, develop lata serious probleas only after long exposure to excessive quantities of dusts. These factors are frequently overlooked when esses slag the lagltiaacy of alleged disease. This la not to iaply that tha claimant does not have abbestosls, but these factors nay he of Interest in evaluating the claimant's exposure during his a^loyment by L. U Insulation. I Jeta B. 61v<b, log. April Ur MM ftp 2 If wo mi 1m of further leteoee, pleeee let m know. Ilaunlfi KLL:dd bee: f. H. Edvard* - Toledo abort L. Logaa, Jr. Atuntj, Lew Departaeat < < 50t