Document 6BX3nZO9zgGBkBkNVe8KBqGmd

tNTtHDtWMrmtNTAU COMMUNICATION TO: FROM: SUUJtCT: See Belov M. F. Flak MICA-ASBESTOS COKTROLS DATE: LOCATION: location: July 27, 1971 Portland Upon reviewing the Occupetionel Health and Safety (OSHA) Standards, ve note a change In the Threahhold Limit* aa regard* nlca. It had been eatabllahad that mica containing 31 or leaa of free tillea (S102) rated aa nulaance duat, limited to 30 M.P.P.C.P. Tha nev Hasard Control Act apeciflea that there shall be a conversion factor baaed on the percent of free silica and Threahhold Limits shall be reduced accordingly. The Threahhold Lialta value for mineral dusts aa adopted by tha Amarican Conference of Governmental Industrial Hygianiata is 230/1 S102 4- 3. Mineral dust containing 2.31 free silica would, be United to 33.4 M.P.P.C.F. Instead of 30 M.P.P.C.P. When placing a purchase order for mica request an analysis of the product especially tha free silica content. Do not confuse combined silica with free allies. The analysis will indicate percent* ages of combined and free silica. The problem will be created whan the employee empties the sacks of mica into the mixer or blender. He and other employees in the area shall veer duat respirators. We recoamend the "Duatfoe 66" obtainable from Mine Safety Appliance. It gives maxima protection against toxic dusts, to the permlsaable limits of lead, plus fibrosis dusts. / Asbestos: We have a similar problem with asbestos, that ls4 when the employee empties the material into the mixer. Ho Threahhold Limits have been established for fibroua asbestos. This is the raw material that Is added to the batch or mix. We must taka every pre caution to eliminate the hasard and to protect tha a^loyee. j ^Tha "Duatfoe 66" is recowended for respiratory protection. The medical profession and hygienists have stated that exposure to asbestos dusts are harmful as the respiratory system cannot expel the dusts. Tha particles lodge in the lungs and keeps building up and . asbestools results from the exposure and breaching of these duets. It Shall be mandatory that tha employee or employee* handling the bags or containers of asbestos wear respirators. Page Two July 27, 1971 Mica and aabaacoa ara lncludad in Cba Fadaral Occupational Safaey and Haaleh Act of 1970, (OSHA). Tha inapaccor will raviaw rulaa and ragulaclona porcaining to aafa handling and pravaneiva aeaaurea. Tha procedures rafarrad Co in Chia leccar ahall ba adopted and enforced. Mr. H. tf. Scharf - Marlacea cc: All Plane Managara (except Canadian) Mr. C. E. Wilaon Mr. E. B. Hollingaworcb Mr. T. W. Richarda Mr. j. tf. Bare Mr. C. tf. Lahnerc Mr. J. B. Moaa TE PROBUC