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)...
