Perfluorobutanesulfonic acid

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Perfluorobutanesulfonic acid
Perfluorobutanesulfonic acid.svg
CAS number 375-73-5 N, 59933-66-3
PubChem 67815 YesY
ChemSpider 61132 YesY
EC number 206-793-1
UN number 3094, 3265
RTECS number EK5930000
Jmol-3D images Image 1
Molecular formula C4HF9O3S
Molar mass 300.10 g/mol
Melting point 76–84 °C[1]
Boiling point 211 °C [2]
EU classification Corrosive (C)
R-phrases R34[3]
Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
 N (verify) (what is: YesY/N?)
Infobox references

Perfluorobutanesulfonic acid (PFBS) is a chemical compound with a four carbon fluorocarbon chain and a sulfonic acid functional group. As an anion it functions as a stable fluorosurfactant because of the strength of carbon–fluorine bonds.

PFBS has served as a replacement for the persistent, toxic, and bioaccumulative perfluorooctanesulfonic acid (PFOS) in 3M's Scotchgard stain repellents since June 2003.[4][5] PFBS has a much shorter half-life in people than PFOS (a little over one month vs. 5.4 years).[6] While PFBS is expected to be persistent in the environment, multiple studies (that are not referenced in following reference[5]) claim that PFBS is neither toxic nor bioaccumulative.[5]

3M markets surfactant with PFBS in two fluorosurfactants.[5]

See also[edit]


  1. ^ "Nonafluorobutanesulphonic acid - 59933-66-3 Catalog of Chemical Suppliers". Retrieved 16 January 2009. 
  2. ^ Perfluorobutanesulfonic acid in the ChemIDplus database
  3. ^ "Safety Data Sheet-Nonafluorobutanesulphonic acid". Retrieved 16 January 2009. 
  4. ^ Ullah, Aziz (October 2006). "The Fluorochemical Dilemma: What the PFOS/PFOA fuss is all about" (PDF). Cleaning & Restoration. Retrieved 16 January 2009. 
  5. ^ a b c Renner R (January 2006). "The long and the short of perfluorinated replacements". Environ. Sci. Technol. 40 (1): 12–3. doi:10.1021/es062612a. PMID 16433328. 
  6. ^ Betts KS (May 2007). "Perfluoroalkyl acids: what is the evidence telling us?". Environ. Health Perspect. 115 (5): A250–6. doi:10.1289/ehp.115-a250. PMC 1867999. PMID 17520044.