Under the Toxic Substances Control Act, the United States Environmental Protection Agency (US EPA) proposed a Significant New Use Rule (SNUR) with recordkeeping requirements for the substance defined as: 'bimodal mixture consisting of multi-walled carbon nanotubes and other classes of carbon nanotubes (generic)'. This is a second attempt at developing a SNUR for this substance as the first rule was withdrawn.
This action of US EPA follows a pre-manufacturing notice (PMN) for this substance to be used as a speciality additive. It is based on concerns for pulmonary toxicity, oncogenicity and environmental toxicity. With this SNUR, the Agency requires specific occupational health and safety measures including the use of personal protective equipment (impervious gloves, protective clothing and a full-face respirator). Dustiness testing shall also be conducted and physical chemical properties data shall be submitted. Finally, the substance shall not be produced for other uses than the ones specified in the original PMN and the substance shall not be released in water beyond what was envisaged in the PMN.
This SNUR will be published in the Federal Register and open for a 30-day commenting period.