EPA is taking direct final action to amend the final test rule, "In Vitro Dermal Absorption Rate Testing of Certain Chemicals of Interest to the Occupational Safety and Health Administration," promulgated under section 4 of the Toxic Substances Control Act (TSCA). This amendment removes dimethyl sulfate (DMS) from the list of chemical substances regulated under the test rule and also removes the requirement that testing be conducted to determine a permeability constant (Kp) for methyl isoamyl ketone (MIAK) and dipropylene glycol methyl ether (DPGME). However, the requirement to conduct testing to measure short-term dermal absorption rates remains for MIAK and DPGME. EPA is basing its decisions to take these actions on information it received since publication of the final rule. Also, upon the effective date of the revocation of the TSCA section 4 testing requirements for DMS, persons who export or intend to export DMS will no longer be subject to the TSCA section 12(b) export notification requirements to the extent that they were triggered by the testing requirements being revoked by this action.