California’s Office of EnvironmentalHealth Hazard Assessment (OEHHA) in has added N-nitrosohexamethyleneimine andgentian violet to its list of carcinogens under Proposition 65 and issued itsnotice of intent to also add para-chlorobenzotrifluoride (PCBTF), a solvent tothe Proposition 65 list of carcinogens.
Companies using any of approximately900 substances listed under Prop 65 are required to provide warnings to Californiansthat using their products may possibly expose them to the chemicals identifiedas carcinogens or toxic to the reproductive system.
Gentianviolet or crystal violet is a dye and an antifungal while N-nitrosohexamethyleneimineis used as an industrial intermediate in chemical production and as an ejectorseat explosive in military jet fighter planes. The two chemicals were added toProp 65 list after an advisory group of ‘state’s qualified expert’ confirmedduring a California Carcinogen Identification Committee (CIC) meeting that thesubstances met the criteria to be considered carcinogenic. The two substanceswere listed effective November 23.
In its notice of intent, the OEHHA announcedthat it’s taking the steps to list PCBTF based on the ‘authoritative bodies’mechanism after a 2018 National Toxicology Program (NTP) reported “clearevidence” of PCBTF’s carcinogenicity.
The NTP’s report on PCBTF’scarcinogenicity was titled “Toxicology and Carcinogenesis Studies of p‑Chloro‑α,α,α‑Trifluorotoluene inSprague Dawley Rats.” The reportedfindings met the sufficiency of the evidenceand formal identification criteria needed to be added to the Prop 65 list. PCBTF is also used as a solvent ininks, coatings and paints.
The useof PCBTF is important for manufacturersin California because its contribution to ground–level ozone formation isinsignificant which makes PCBTF an approved alternative solvent that meets thestrict requirements for volatile organic compound (VOC) emissions.
The public comments period on thePCBTF proposal was initially set to end on December 24, but the AmericanCoatings Association (ACA) requested an extension. California’s Office ofEnvironmental Health Hazard Assessment (OEHHA) agreed to extend the publiccomment period until January 23, 2019.