On July 28, 2009, the U.S. Environmental Protection Agency (EPA) clarified its June 24, 2009, final Significant New Use Rules (SNUR) for multi- and single-walled carbon nanotubes (CNT). According to EPA, upon review of the final rule, stakeholders asked whether the SNURs applied to all types of CNTs. EPA responded:
This is not the case. These SNURs only apply to the specific carbon nanotubes that were the subject of the premanufacture notices (PMN) submitted under Section 5 of TSCA and not to any other carbon nanotubes. Other carbon nanotubes must be notified through EPA’s New Chemicals Program. The U.S. EPA strongly encourages all manufacturers and importers of nanoscale materials that are intended for commercial use to consult with the Agency in advance of production or importation.