Document dQ11rm2a9w5dKYE297xKx9pgq

.- 0031-0 OWENS-CORNING FIBERGLAS CORPORATION umA-cowAirr cornsroioorcE UhralalM Xnrcofc. OUa Anmtsoa <<<ME1KSUJQ30X ECR RECORD r- Mr, 1. R, Morrison Sabici DOST COURTS April 7, 1947 co: Mr. H. W, Collins Mr. R. Erl* Mr. D. MaCrory Mr. C. 1. Smacker Dr. L. P. Blefeld Mr. A. R. Morris or.*-' rile aiBowciiog Dust counts were n&de in the Insulation Cement Department to determine the extent of an asbestos dust hazard. SUMy-ART The average concentration of aabeBtos dust on the first floor of the oeaant department was 7 to 12 million particles per cubic foot of air. The asbestos concentration on the second floor was 12 to 25 million particles per cublo foot of air. The Ohio Department of Health has recognized 5 nlllon particles of asbestos dust per cubic foot of air ss the maximum allowable concentration for an 6-hour daily exposure. REGOMreXDATIQSS Possible eolutions to the dust problem arei 1. Substitution of another material for asbestos. 2. Installstion of more efficient local exheuat systems. 3. furnishing suitable respirators for the operators. These should be worn continuously. DISCUSSION Dust counts were mle using a *ZelBS JConlaeter". The samples taken as near the operator as possible in order to approximate the duat concentrations at hie breathing level. Dust compositions vers determined petrographically by tha Class Research Department. Several different types of ceaent are mixed in the depturtment with varying amounts of aabestos. The cement being mixed when the dust counts were made contained aabestoa shorts, glass wool nodulas, Bentonlue end soap. 02 203 1273. MIA M5DLTS OF DOST C(KITS first floor Remoring bag, weighing operation* - 15-30 million particlea/cu, ft. (50$ af operators time) Bag filling and other operation* - 10-20 million p&rticle*/cu. ft. (50JC of operators time) iTerage concentration - 12.5-25 million particle/cu. ft. Dust composition - 50JC asbestos. irerage asbeeto* concentration - 7-12 million particlea/cu. ft. Second floor Weighing and charging mixer (30$ of operators time) - 30-50 million particlea/cu. ft. Mixing operation (70f of operators time) - 10-20 particles/cu. ft. lrerac-e concentration - 15-30 million particlee/cu. ft. Dust composition - 805 asbestos Average asbertos cone entration - 12-25 million -articles/cu. ft. 1. R, Morrison ree 02 203 1274