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Multilayer quartz sand screening machine

Oct 28, 2021 For the blaster helper a 57-minute personal air sample indicated a respirable quartz concentration of 0.52 mg/m 3. A 65-minute area air sample indicated a respirable quartz concentration of 0.26 mg/m 3. Figure 1. Abrasive blasting of concrete containing crystalline silica (silica sand is the abrasive). Bridge Demolition

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