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Perfluorobutanesulfonic acid
Perfluorobutanesulfonic acid.svg
Other names Perfluorobutane sulfonate, PFBS, Nonaflate, FC-98, Nonafluorobutanesulphonic acid
CAS number 375-73-5, 59933-66-3
PubChem 67815
EC number 206-793-1
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, 100 kPa)
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 indicate PFBS is neither toxic nor bioaccumulative.[5]

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

See also


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