Final rule · 2026-22888

Modification of Significant New Uses of Certain Chemical Substances (23-1.M)

EPA is amending significant new use rules (SNURs) issued under section 5(a)(2) of the Toxic Substances Control Act (TSCA) for certain chemical substances identified herein, which were the subject of premanufacture notices (PMNs) and significant new use notices (SNUNs). This action amends the SNURs by allowing certain new uses reported in the SNUNs or PMNs without additional notification requirements, modifying the significant new use notification requirements based on the actions and determinations for the SNUN or PMN submissions or based on the examination of new test data or other information, and making technical amendments to several SNURs. EPA is issuing these amendments based on review of new and existing data for the chemical substances.