EPA Publishes Final SNUR For Multi-Walled Carbon Nanotubes (PMN P-23-105)

The U.S. Environmental Protection Agency (EPA) published final significant new use rules (SNUR) on November 5, 2026, for certain chemical substances that were the subject of premanufacture notices (PMN) and are also subject to an Order issued by EPA pursuant to the Toxic Substances Control Act (TSCA). 91 Fed. Reg. 69704. The chemical substances include multi-walled carbon nanotubes (PMN P-23-105). Under the SNUR, persons who intend to manufacture (defined by statute to include import) or process multi-walled carbon nanotubes (PMN P-23-105) for an activity that is designated as a significant new use must notify EPA at least 90 days before commencing that activity. The significant new uses include: