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The silica rule is a jobsite regulation designed to protect workers from all RCS exposures above 50 µg/m3, which is the PEL as defined by OSHA. Under normal jobsite conditions, industrial hygiene testing conducted by a third-party, indicated that the sanding of Sheetrock® Brand ready-mixed joint compound, unless otherwise specified on packaging and within the SDS, does not contain RCS above the PEL.