Document a12XOXovQORnX6aamovX8rQZe

fNOIH CM IMO AMO INVPCCTION OtPAPTMCNt i-u. Casualty and SuretyGompany HARVFOt^, COPCNKCnCUT A^flwiATM *r ^TMA urt ItllUftAMtl COMPANY THt AUtQMOtH INIUrANQC COMPAHV fM< CtAWOAMC r*t iNCU*AGtt COHPUNT June 21, 1941 Ur. John A. Hill BWsaer h Hill, 0/A., 5th Fir., Hone Bank Bldg. Toledo, Ohio Dear Ur. Hills He: Oweas-Coralng Flbarglaa Corporation I ha-re learned from the field that there has been considerable discussion relative to the occupational disease hazard in the use of fiberglaa. >sjj you know, I have been rery much interested in the study of silicosle over a period of yaers, especially from the research angle, on4 I CAn_r.etrr f*v that ` >r stating thet f ibe^lasYa^aore X believe that most articles covering cecupationel disease exposure definitely warn of the hazards of .asbestos is growing out of the use of asbestos. Heist I've to the use of fiberglas, rock wool or sleg wool, I have discussed this matter very thoroughly with our Medical Department insofar as It applies to the in stallation of glass wool and its relation to silicosis, and X know of no better answer to give you than their direct statement: ",/e may definitely state that this la not possible, based upon the established fact that silicates of which glass wool ia composed will not produce silicosis or a similar condition. Free silica, vihich when Inhaled In sufficient quantity will produce silicosis, is one of the ingredients of many varieties of glass. However, in the manufacturing process, the free silica chemically unites with other substances, leading to the production of silicates, and glass Is a solid solution of these various silicates produced by the fusion of free silica with metallic oxides. Glass wcol con sists cf glass In the form of very fine strands," Dr. 11. Cray, In his publication "Attorneys Textbook of Medicine,* states; "It Is -idmltted that silicon dioxide is ti only substance capable of producing silicosle." I believe, from the statements ylven stove and other finding? which ve cun readily place before you, it v;i H be agreed thet silicosis can not be produced by silicate and I, therefor^, see no reason for the ctatements thet have already been mnde, nnjT'/'ly, "that flfcerl;i3 produces atltocsis" because. Insofar as 1 can find, this statement is contrary to fe 01 501 The /Etna Casualty and Surety Company HARTFORD, COMNECtlCUT A r riciAti or NA LlFC CO*HV TMC AUtQHO^lUC INlUHANCC COM*AMV THE ITAMQAAO INIUMAMCC CQHMNV CNOiNcr.niNO amo >nocction 0*^A*TMMT Jane 21, 1941 Hr. John A. HUL Elbsser Hill, 0/A., 5th Fir., Hone Sank Eldg. Toledo, Ohio Dear Hr. Hill; He: Owens-Cornlng flberRlas Corporation I have learned from the field that there has been considerable discussion relative to the occupational disease hazard in the use of fiberglaa. As you know, I have been very ouch interested In the study of silicosis over a period of veers, especially from the research angle, and I can very frankly say that In all my experience 1 can not see any reason for stating that flberglas is jnors harardous than rock wool, slag wool or asbestos. I believe that most articles covering occupational disease exposure definitely warn of the hazards of aabestosis growing out of the use of asbestos. Relative to the use of flherglas, rock wool or slag wool, I have discussed this matter very thoroughly with our liedieal Department insofar as it applies to the in stallation of glass wool and Its relation to silicosis, and I know of no better answer to give you than their direct statement: -,/c may definitely stat9 that this is not possible, based upon the established fact that silicates of which gloss wool is composed will not produce 3ilicosis or a similar condition# Free silica, jhleh when Inhaled In sufficient quantity win produce silicosis, is one of the ingredients of many varieties of glass. llc-.w>Ter, i2 the mnnufectaring process, the free silica chemically unites with other substances, leading to the production of silicates, and glass la a solid solution of these various silicates produced by the fusion of free silica with metallic oxides. Glass weol con sists of glass in the form of very fine strands*" Dr. R, Gray, in hi3 publication "Attorneys Textbook of Hedlcine,*' states: "It is admitted that silicon dioxide is the only substance capable of producing silicosis." X believe, from the statements given above and other finding? which we cun readily place before you, it will b< egreed that silicosis can not be produced by silicate; &j;d I, therefor-*, see no reason for the jtatenents that have already been made, nom-ly, "that flterglas producer silicosis" because, Insofar as Lean find, this