The EU officially classifies ultra-short PFAS—trifluoroacetic acid (TFA)—as a reproductive toxic substance!

Original link: https://echa.europa.eu/documents/d/guest/rac77_final_minutes_en

On June 5th, the ECHA Risk Assessment Committee (RAC) passed a resolution at its 77th plenary session, classifying trifluoroacetic acid (TFA) and its inorganic salts as Class 1B reproductive toxicity substances, and simultaneously assigning dual hazard labels of PMT (Persistence, Mobility, Toxicity) and vPvM (High Persistence, High Mobility). This is the highest level of hazard determination made for TFA within the framework of the EU CLP regulations to date, and it will directly affect the compliance paths of HFO/HCFO refrigerants, fluorinated pesticides, and related downstream industries.

— The core resolution of RAC-77: TFA classification

From June 1st to 5th, 2026, the Risk Assessment Committee of the European Chemicals Agency (ECHA) held its 77th plenary session in Helsinki. The most substantive resolution of this meeting was the unanimous consensus reached on the coordinated classification and labelling (CLH) of trichloroacetic acid (TFA, CAS 76-05-1) and inorganic salts such as sodium salts.

For the TFA acid itself, the final hazard category adopted by the RAC was: Acute inhalation toxicity category 3 (H331, ATE = 3 mg/L vapor), acute oral toxicity category 4 (H302, ATE = 500 mg/kg bw), reproductive toxicity category 1B (H360Df), and dual labelling of PMT (EUH450) and vPvM (EUH451), with an additional EUH071 (inhalation hazard warning) attached. Compared to the current Annex VI items which only contain acute toxicity category 4 and skin corrosion category 1A, the new recognition of reproductive toxicity 1B and PMT/vPvM in this meeting represents a fundamental leap in terms of hazard levels and regulatory implications.

For sodium salts and other inorganic salts, the RAC's opinion was reproductive toxicity category 1B (H360Df), PMT (EUH450), and vPvM (EUH451), and it specifically noted that the classification of this item is based on the common hazards of each member substance, and users still need to assess on their own whether the more stringent classification is applicable for the non-common parts.

— The source and spread of TFA: HFO refrigerants are the largest annual emission source

The reason why TFA holds a special position in the chemical regulatory system is that it is not a single-purpose product but the ultimate product of the degradation of various fluorinated substances in the environment. The emission estimation by the German Environmental Protection Agency (UBA) in 2022 showed that the atmospheric photochemical degradation of new refrigerants and foam blowing agents such as HFO-1234yf constitutes the largest annual source of TFA in Germany, estimated at approximately 2,000 tons per year; the degradation of fluorinated pesticides contributes about 457 tons, and the combined contribution from pharmaceuticals and other sources is approximately 29 tons.

This emission structure implies that even if pesticide use is tightened at the source end, as long as HFO refrigerants continue to be widely used, the environmental accumulation of TFA will not stop. TFA is extremely stable in water bodies and soil, and conventional water treatment processes cannot effectively remove it. The concentration of TFA in groundwater, rainwater and drinking water is increasing year by year. 

Angeliki Lysimachou, the Director of Science and Policy at PAN Europe, stated:

"Current evidence indicates that TFA can interfere with the normal pregnancy process and early childhood development. Its absolute persistence in the environment, as well as the continuously rising detection concentrations in European water resources, require regulatory agencies to take urgent action against all TFA precursor substances, and in particular, the use of fluorinated pesticides should be immediately prohibited."

— Industry dissent and interest-driven negotiations

During the RAC-77 plenary session, industry groups such as CEFIC and CropLife Europe, as well as appointed experts, raised several technical objections regarding reproductive toxicity and the PMT classification. During the public consultation phase, enterprises represented by HN had previously raised an "artificial illusion" objection to the fetal retinal folding phenomenon observed in specific animal experiments, attempting to reduce the weight of this data in the determination of reproductive toxicity. However, after independent review by RAC, the judgment of the German applicant was upheld.

Previously, PAN Europe released a report stating that several major chemical companies had systematically questioned the toxicity data of TFA over the past few years, delaying the progress of the regulatory process. SW announced in 2025 that it would stop the production of TFA and its derivatives, partially reflecting the industry's anticipation of stricter regulations.

— Subsequent regulatory nodes: CLP revision, EFSA assessment and Drinking Water Directive

After the RAC opinion is approved, the process moves to the EU Commission level. The Commission will draft the revised ATP of the CLP regulation based on this, and it can only come into effect after going through the legislative process. From historical cases, it takes approximately 2 to 4 years from the CLH opinion to the formal regulation.

Concurrently, the independent health reference value assessment by EFSA is underway. The EU Commission has entrusted EFSA to develop the ADI (Daily Acceptable Intake) and ARfD (Acute Reference Dose) for TFA, with the consultation deadline set for July 31, 2026. The final opinion is expected to be released by the end of 2026. Additionally, the Commission has also entrusted EFSA and ECHA to jointly assess the migration and degradation behavior of TFA in soil and water bodies, with the deadline extended to June 2027 to improve the applicability of the existing test criteria for the assessment of TFA generation.

At the level of drinking water monitoring, the EU Drinking Water Directive (2020/2184) requires member states to start monitoring "the sum of 20 PFAS" or "total PFAS" (including TFA) from January 12, 2026, to confirm the compliance status at the end-of-tap water outlets. However, this directive has not yet set a numerical limit for TFA alone.

— The actual impact on the HFOs/HCFOs industry chain

Once the ATP procedure officially comes into effect for TFA's Rep. 1B + PMT/vPvM classification, it will trigger a series of compliance obligations under the CLP regulations: the SDS (Safety Data Sheet) for products containing TFA needs to update the hazard section, and the labels must add the corresponding pictograms (GHS08) and hazard descriptions; under the REACH framework, if the formulations containing TFA exceed the exemption concentration limit, they may need to be re-evaluated to determine if they are subject to authorization obligations.

The deeper impact lies in market expectations. HFO-1234yf and other fourth-generation HFO refrigerants that degrade to produce TFA are continuously scrutinized due to the issue of TFA as an atmospheric degradation product. The EU F-gas regulations have set a phased elimination schedule for HFCs, and the environmental cost of HFOs as alternative solutions is being re-measured.

For refrigerant producers and downstream filling enterprises, it is necessary to review the quantification path of TFA emissions in advance, participate in the monitoring and evaluation procedures of the European Commission, and formally incorporate them into the action agenda. The call for innovation and development of fifth-generation F-gas refrigerants (with zero ODP, low GWP, and zero TFA degradation) has officially sounded!

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