EPA is finalizing a significant new use rule (SNUR) under the Toxic Substances Control Act (TSCA) for chemical substances identified generically as complex strontium aluminate, rare earth doped, which were the subject of several premanufacture notices (PMNs). This action requires persons who intend to manufacture (including import) or process any of the chemical substances for an activity that is designated as a significant new use by this final rule to notify EPA at least 90 days before commencing that activity. The required notification would provide EPA with the opportunity to evaluate the intended use and, if necessary, to prohibit or limit the activity before it occurs.