The US Environmental Protection Agency (EPA) is proposing to amend thesignificant new use rule(Snur) for 1-propene, 2,3,3,3-tetrafluoro to allow manufacturing for certain uses without providing notice to the agency.

Under section 5(a)(2) of the Toxic Substances Control Act (TSCA), EPA is proposing to amend the significant new use rule (SNUR) for the chemical substance identified as 1-Propene, 2,3,3,3-tetrafluoro-, which was the subject of premanufacture notice (PMN) P-07-601. This action would amend the SNUR to allow the manufacture and processing for certain uses without requiring a significant new use notice (SNUN). EPA is proposing this amendment based on review of newly submitted exposure and toxicity data.