On April 6, 2011, several members of the NanoSafety Consortium submitted to the U.S. Environmental Protection Agency (EPA) a proposed testing agreement under Section 4 of the Toxic Substances Control Act (TSCA). Under the proposed testing agreement, the substances to be tested may include multi-walled carbon nanotubes, double-walled carbon nanotubes, single-walled carbon nanotubes, and graphene nanoplatelets. Participants would conduct 90-day inhalation toxicity studies in rats, and submit interim progress reports to EPA at 60-day intervals, and a final report within 120 days of the conclusion of testing. Under the proposed testing agreement, if EPA promulgated a TSCA Section 5(a)(2) significant new use rule (SNUR) applicable to the test substances, then the testing agreement would have the status of a TSCA Section 5(b)(1)(A) test rule. The NanoSafety Consortium asked that EPA “expeditiously consider” the proposed testing agreement and begin the public comment and negotiation process at its “earliest possible convenience.”