 100PPM TWA Tetrachloroethylene
25PPM TWA Methylene Chloride

For comparison permissible exposure level of heptane is much higher at 500PPM TWA.TWA is an 8 hour time weighed average exposure level deemed to be safe by US OSHA.For environmental and health safety reasons, the State of California has banned the use of perchloroethylene and methylene chloride in multi-purpose lubricants such as Jig-A-Loo Dec 31, 2010 and the sale of remaining inventory will be banned effective Dec 31, 2013.