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why silica content is important in crushing

Compliance and Safety for Silica If you work in a profession that involves crushing asphalt concrete or rocks eg mining milling or construction you’re probably aware of OSHA’s tightening Permissible Exposure Limit PEL for respirable crystalline silica Table 1 of OSHA Standard 29 CFR 19261153The new standard – 50 micrograms per cubic meter with an active level of 25

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