Candidate List of substances of very high concern for Authorisation

Candidate List of substances of very high concern for Authorisation

(published in accordance with Article 59(10) of the REACH Regulation)

Candidate List of substances of very high concern for Authorisation


  • Authentic version: Only the Candidate List published on this website is deemed authentic. Companies may have immediate legal obligations following the inclusion of a substance in the Candidate List on this website including in particular Articles 7, 31 and 33 of the REACH Regulation.
  • Numerical identifiers: Each candidate list entry covers both anhydrous and hydrated forms of a substance. The CAS number shown in an entry is typically for the anhydrous form. Hydrated forms of the substance identified by other CAS numbers are still within the scope of the entry.
  • Other numerical identifiers: For those entries with "-" in the EC number and CAS number columns, a non-exhaustive inventory of EC and/or CAS Registry numbers describing substances or groups of substances considered to fall within the scope of the Candidate List entry is included, where practicably possible. This information can be accessed through the "Details" button of the selected entry. 

Perfluorobutane sulfonic acid (PFBS) and its salts

EC No.: - CAS No.: -
Reason for inclusion
Equivalent level of concern having probable serious effects to human health (Article 57(f) - human health)
Equivalent level of concern having probable serious effects to the environment (Article 57(f) - environment)
Date of inclusion
IUCLID dataset
Support document
Response to comments
The combined intrinsic properties justifying the inclusion as a substance for which there is scientific evidence of probable serious effects to human health and the environment which give rise to an equivalent level of concern are the following: very high persistence, high mobility in water and soil, high potential for long-range transport, and difficulty of remediation and water purification as well as moderate bioaccumulation in humans. The observed probable serious effects for human health and the environment are thyroid hormonal disturbances and reproductive toxicity seen in rodents, and effects on liver, kidney and haematological system in rats, hormonal disturbances and effects on reproduction in marine medaka fish and effects on expression of hormone receptors in tadpoles. Together, these elements lead to a very high potential for irreversible effects.

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Group members
This group of substance has the following member substances:
Results list is empty
Name EC / List no. CAS no. Association
Potassium 1,1,2,2,3,3,4,4,4-nonafluorobutane-1-sulphonate 249-616-3 29420-49-3 Official source
Ammonium 1,1,2,2,3,3,4,4,4-nonafluorobutane-1-sulphonate 269-513-7 68259-10-9 Official source
1,1,2,2,3,3,4,4,4-nonafluorobutane-1-sulphonic acid 206-793-1 375-73-5 Official source
magnesium perfluorobutanesulfonate - 507453-86-3 Official source
lithium perfluorobutanesulfonate - 131651-65-5 Official source
N,N,N-triethylethanaminium 1,1,2,2,3,3,4,4,4-nonafluorobutane-1-sulfonate - 25628-08-4 Official source
bis(4-t-butylphenyl)iodonium perfluorobutanesulfonate 432-660-4 194999-85-4 Official source
tetrabutyl-phosphonium nonafluoro-butane-1-sulfonate 444-440-5 220689-12-3 Official source
dimethyl(phenyl)sulfanium perfluorobutanesulfonate 452-310-4 220133-51-7 Official source
1-(4-butoxy-1-naphthalenyl)tetrahydrothiophenium 1,1,2,2,3,3,4,4,4-nonafluoro-1-butanesulfonate 468-770-4 - Official source
Triphenylsulfanium perfluorobutane sulfonate 478-340-8 144317-44-2 Official source
morpholinium perfluorobutanesulfonate - 503155-89-3 Official source

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