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MSHA -  Title 30 CFR

30 CFR § 47.81

Provisions for withholding trade secrets.

(a) Operators may withhold the identity of a trade secret chemical, including the name and other specific identification, from the written list of hazardous chemicals, the label, and the MSDS, provided that the operator-- (b) The operator must make the chemical's identity available to miners, designated representatives, and health professionals in accordance with the provisions of this subpart.
(c) This subpart does not require the operator to disclose process or percentage of mixture information, which is a trade secret, under any circumstances.