Under section 5(a)(2) of the Toxic Substances Control Act (TSCA) and 40 CFR 721.185, EPA is amending three significant new use rules (SNURs) to allow certain uses without requiring a significant new use notice (SNUN). EPA is amending these rules based on review of new toxicity test data on one chemical and review of SNUNs for the other two chemicals. The amended SNURs would continue to require a SNUN for new uses that may involve significant changes in human or environmental exposure.