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OSHA comments from the January 19, 1989 Final Rule on Air Contaminants Project extracted from 54FR2332 et. seq. This rule was remanded by the U.S. Circuit Court of Appeals and the limits are not currently in force.

CAS: multi methylene chloride 75-09-2 trichlorethylene 79-01-6 perchlorethylene 127-18-4 1970 PEL 500 ppm twa 1000 ppm ceil* 2000 ppm peak 100 ppm twa 200 ppm ceil* 300 ppm peak 100 ppm twa 200 ppm ceil* 300 ppm peak 1988 PEL (revoked) in rulemaking at time 50 ppm twa 200 ppm STEL** 25 ppm 1994 * 5 minutes in any 2 hours ** 15 minute short term exposure limit


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