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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Physical & Chemical properties

Boiling point

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boiling point
Type of information:
experimental study
Adequacy of study:
weight of evidence
Study period:
no data
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
study well documented, meets generally accepted scientific principles, acceptable for assessment
Principles of method if other than guideline:
There was no information on the method used.
GLP compliance:
prior to GLP standards
Type of method:
other: No information provided on the method
Specific details on test material used for the study:
The material isolated in the publication corresponds to the mixture of isomers described in the registration dossier.
Boiling pt.:
>= 29 - <= 41 °C
Remarks on result:
other: the BP was found dependent on the proportion of the two isomers

The fraction with boiling point 41°C contains 95-97% of the cyclic isomer tetrafluoro-2-hydroxyethanesulfonic β-sultone and 3% of the linear isomer difluoro(ftuorosulfonyl)acetyl fluoride.

The linear isomer difluoro(ftuorosulfonyl)acetyl fluoride at 100% had a boiling point of 29°C.

Composition was confirmed by chromatographic analysis.

The product obtained by the reaction of fluoroolefins with sulfur trioxide can be affected by the conditions of temperature and time and result in a mixture of two isomers: cyclic tetrafluoro-2-hydroxyethanesulfonic β-sultone and linear difluoro(ftuorosulfonyl)acetyl fluoride. The proportion of which can be modified with time and temperature, resulting in a decrease of the boiling point from 41°C to 29°C.
Analysis confirmed that the fraction with boiling point 41°C contains the cyclic isomer tetrafluoro-2-hydroxyethanesulfonic β-sultone 95-97% pure, and the low boiling point fraction with BP 29°C consisted of pure linear isomer difluoro(ftuorosulfonyl)acetyl fluoride.

Description of key information

Based on boiling points determined for the individual constituents taken isolated, the boiling point of the reaction mass is between 29°C and 42°C, and is dependent on the proportion of each isomer in the reaction mass (the linear form, with the lower boiling point, becoming the predominant constituent in the reaction mass of isomers over time).

Key value for chemical safety assessment

Additional information