Document Jr50JqnBqnKkQ7XVOp00N0XEv

J0k. QEORQIA-PAC1F1C INTKROCMFTMCNTAl. COMMUNICATION 701 rNOM-. *See Belov M# Ft Ftnk *uajICT; MICA-ASBESTOS CONTROLS OATfc LOCATION! location July 27, 1971 Portland Upon reviewing the Occupational Health and Safety (OSHA) Standards, we nota a change In tha Thraehhold Limits aa retards mica. It had bean established that mica containing 31 or lass of free silica (Si02) raced as nuisance dust, Halted to 50 M.F.F.C.F. Tha new Hazard Control Act specifies that there shall be a conversion factor based on the percent of free silica and Threshhold Limits shall be reduced accordingly. The Threshhold Limits value for mineral dusts as adopted by tbs American Conference of Governmental tldustrial Hygienists la 250/1 S102 + 5. Mineral dust containing 2.51 free silica would. be limited to 33.4 M.P.F.C.F. Instead of 30 M.F.F.C.F. When placing a purchase order for mica request sn analysis of the product especially tha free silica content. Do not confuse combined silica with free silica. Tha analysis mill indicate percenttages of combined and free silica. The problem will be created when the employee empties the sacks of mica into the mixer or blander. He and other employees in the area shall wear dust respirators. We recommend the "Dustfoe 66" obtainable from Mina Safety Appliance. It gives mssisue protection against toxic dusts, to the perodLssabla limits of lead, plus fibrosis dusts. Asbestos * We. have a similar problem vith asbestos, that is when che employee empties the material into the mixer. Ho Threshhold Limits have been established for fibroua asbestos. This is the rev material that is added to the batch or mix. We must taka every pre caution to eliminate the hazard and to protect the employee. . The "Dnitfoe 66'* is recommended for respiratory protection. The medical profession and hygienists have stated that exposure to asbestos dusts arm harmful as the respiratory system cannot expel che dusts. Tha particles lodge in the lungs and keeps building up and ashestools results from the exposure and breaching of these dusts. It Shall be mandatory that the employee or employees handling the bags or containers of asbestos wear respirators. ABATE PROBUC MAY 1994 Page Two July 27, 1971 Mica and aabaaeoa are Included In eh* Federal Occupational Safety and Health Act of 1970, (OSHA). The inspector will ravlav rules and regulations pertaining to safe handling and preventive measures. The procedures referred to in this letter shall be adopted and enforced. MFF/ab *Mr. K. V. Brown Mr. J. D. Rauch Mr. P. A. Jackeon * Chicago Mr. H. W. Scharf - Marietta cc: All Plant Managers (except Canadian) Mr. C. E. Wilson Mr. E. B. Hollingsworth Mr. T. V. Richards Mr. J. W. Hart Mr. C. V. Lahnart Mr. J. B. Moss