Business Services 02:26 Steps Production Times Investigations revealed that the sandblasters worked in enclosed but vented blasting chambers. Although supplied-air respirators were available to the workers, investigators indicated that they wore only negative-pressure, half-mask respirators with disposable filters. Workers in the blasting room were being exposed outside the mask to 98% crystalline silica sand at a concentration of 15 million particles per cubic foot (5 times the 1974 OSHA standard). A later investigation indicated that workers were using the supplied-air respirators but that they were being exposed to crystalline silica at a concentration of 3,400 µg/m3 as a TWA (18 times the 1974 OSHA standard).****
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Report all cases of silicosis to State health departments and to OSHA or the Mine Safety and Health Administration (MSHA). Connect DC
Whitt's Dustless Blasting is excellent for the removal of paint, polyurethane, lacquer, stain and any other coating from wood quickly and easily. Even old wood can be made to look brand new, as shown in the photos below... Don't try to blast a balsa wood airplane though; It won't fly worth a dern afterwards.
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Air monitoring should be performed to measure worker exposure to airborne crystalline silica and to provide a basis for selecting engineering controls. Air monitoring should be performed as needed to measure the effectiveness of controls. Air samples should be collected and analyzed according to NIOSH Method Nos. 7500 and 7602 [NIOSH 1984] or their equivalent.
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Factories Act, 1937 and 1948–blasting (castings and other articles) special regulations, [1949]. London, England: Ministry of Labour and National Service, Factory Department, SI 1949, No. 2225, pp. 4331-4335.
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