SAN FRANCISCO - Fed-OSHA has reopened the rulemaking record on methylene chloride (MC), a probable human carcinogen that is widely used as an industrial solvent. The rule was originally proposed in 1991. Two informal public hearings were held, including one in San Francisco October 14-16, 1992. (See Vol 19 EVENTS, pp. 00-5490 and -5491.)The proposed rule would reduce the permissible worker exposure to the chemical from the current 500 parts per million to 25 ppm averaged over eight hours. OSHA has est
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