Manufacturer Request for Risk Evaluation of OTNE

On November 20, 2020, EPA received a manufacturer request for risk evaluation for the chemical substances in the octahydro-tetramethyl-naphthalenyl-ethanone chemical category (OTNE).  These substances are used as fragrance ingredients.  The three manufacturers, International Flavors and Fragrances, Inc., Privi Organics USA Corporation, and DRT America, Inc., sent the request through the OTNE Consortium.

The risk evaluation request applies to four chemicals within OTNE.  The Toxic Substances Control Act (TSCA) considers two of the chemicals to be persistent, bioaccumulative and toxic (PBT) chemicals.  While completing the risk evaluation for the OTNE chemical, EPA is not allowed to consider costs or other non-risk factors (15 U.S.C. 2605(b)(4)(F)(iii)).  The request for evaluation also includes possible conditions of use for EPA to identify.

EPA has until no later than June 5, 2021 to either grant or deny the request to conduct the risk evaluation for the OTNE chemicals.  In order for EPA to grant the request, it must meet all of the requirements listed under 40 CFR 702.37(e)(6)(ii).  These conditions are that the request constitutes conditions of use that warrant inclusion in a risk evaluation, EPA has all the necessary information to conduct the risk evaluation, and all the remaining criteria of 40 CFR 702.37 are met, such as manufacturers paying fees to support the risk evaluations.

PBT Rules

In January 2021, EPA published the final rules for five Persistent, Bioaccumulative, and Toxic (PBT) chemicals.  The public comment period for these rules is open until May 17, 2021.  The five PBT chemicals are:

  • Decabromodiphenyl ether (DecaBDE)
  • Phenol, isopropylated phosphate (3:1) (PIP (3:1))
  • 2,4,6-Tris(tert-butyl)phenol (2,4,6-TTBP)
  • Hexachlorobutadiene (HCBD)
  • Pentachlorothiophenol (PCTP)

DecaBDE is used as an additive flame retardant in plastic enclosures for TVs, computers, and other household appliances.  It is toxic to aquatic animals and terrestrial invertebrates, causing developmental, neurological, and immunological issues.  It also harms the liver and is a carcinogen.  EPA’s published rule for decaBDE prohibits the manufacture, important, process and distribution of decaBDE products with a few exceptions, such as wire and cable for the two-year period until the prohibition goes into effect.

PIP (3:1) is used as a plasticizer, flame retardant, anti-wear additive, and anti-compressibility additive.  It is toxic to aquatic plants and animals, potentially causing reproductive and developmental effects on the animals’ organs.  EPA’s published rule for PIP (3:1) prohibits processing and distribution of PIP (3:1) and products containing it with some exceptions, such as various automotive and aviation products.  EPA issued a temporary 180-day “No Action Assurance” on the prohibitions for processing and distributing PIP (3:1) articles, which gives EPA enforcement discretion to ensure important articles are no interrupted in the supply chain.

2,4,6-TTBP is used as a reactant in processing and is used in fuel, fuel-related additives, oils, and lubricants.  It is toxic to aquatic plants and animals, causing developmental issues and harm to the liver. EPA’s published rule is to effectively prevent the use of 2,4,6-TTBP as a fuel injector cleaner and fuel additive for small commercial operations by prohibiting distributions of the chemical in concentrations above 0.3% in any container with less than 35 gallons.  Additionally, EPA prohibits its use as an oil and lubricant additive in concentrations of 0.3% regardless of the container size.

HCBD is burned as waste fuel after being created as a byproduct in the manufacturing of chlorinated hydrocarbons, particularly perchloroethylene, trichloroethylene, and carbon tetrachloride.  It is toxic to aquatic animals, birds, causing renal, reproductive, and developmental effects.  It is also potentially a human carcinogen. EPA’s published rule prohibits manufacturing, processing, and distributing HCBD is all products except those that unintentionally create it as a byproduct in the production of chlorinated solvents.

PCTP is used to make rubber more pliable.  It is toxic to fish, plants, and birds, causing liver and reproductive effects.  EPA’s published rule prohibits the manufacturing, processing, and distribution of all PCTP products above 1% concentration by weight of the chemical.

EPA Changing Systematic Review Approach

In February 2021, EPA announced the Agency’s commitment to strengthening science used in chemical risk evaluations.  EPA stated the Agency will continue to update its systematic review approach and its broader efforts to review the first 10 TSCA risk evaluations.  The first 10 TSCA risk evaluations were complete in January 2021.  Following the review of their 2018 systematic review approach by the National Academies of Science, Engineering, and Medicine (NAS), EPA stated they will never use that particular systematic review again.

NAS recommendations included:

  • Engaging in ongoing cross-sector efforts to develop and validate new tools and approaches.
  • Incorporating components of existing hazard assessments approaches.
  • Creating a handbook to assist with incomplete and hard to follow documentation.
  • Using standard descriptors for the strength of evidence.

EPA stressed that the NAS report was based on earlier EPA practices, and part of the reason for updating the systematic review approach is to ensure the review of the first 10 TSCA risk evaluations are done in accordance with Executive Orders and other directives from the Biden Administration.  The Agency’s goals from the review are that:

  • All Agency actions meet statutory obligations,
  • Be guided by the best available science,
  • Ensure the integrity of Federal decision-making, and
  • Protect human health and the environment.

EPA has begun the process of creating a TSCA systematic review protocol in collaboration with the Agency’s Office of Research and Development.  The new review protocol will incorporate approaches from the Integrated Risk Information System (IRIS) Program, as recommended by NAS.  EPA expects to publish and take comments on the new review protocol later this year.