The company I work for does metal heat treating and the hand blaster and wheelabrators (2) are in the same enclosed room. What is the best way to explain to my boss that exposure to the glassbead and abrasive shot, which containes 4% silica, over time can cause health problems. Also, is the PEL, based on the time spent in this room, an even greater factor since both materials may be dusting the users at the same time?
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