If a nanoscale material is listed on the TSCA Inventory it is considered 'existing' it is not subject to new chemical
reporting requirements. If it is not Inventory listed, EPA considers the substance 'new' and, unless a PMN exemption
applies, the manufacturer must submit a PMN to EPA at least 90 days before commencing commercial manufacture
The cost and timing of satisfying PMN requirements are difficult to predict and inject uncertainty into an already uncertain business environment. EPA's guidance is a must-read for nanoscale material manufacturers, as it can assist in determining how to proceed with newly developed materials.
EPA seeks comment on the guidance by September 10, 2007, and I encourage all stakeholders to contribute to this
critically important discussion. Comments on the TSCA Inventory Status of Nanoscale Substances -- General
Approach must be identified by the docket ID number that EPA has established for it: EPA-HQ-OPPT-2004-0122.