Registration Dossier

Data platform availability banner - registered substances factsheets

Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Administrative data

dissociation constant
Data waiving:
study technically not feasible
Justification for data waiving:
the study does not need to be conducted because the substance is hydrolytically unstable (half-life less than 12 hours)
Justification for type of information:
Sulphur trioxide reacts vigorously and extremely exothermically with water to give sulphuric acid. Therefore, it is not possible to experimentally determine the dissociation constant of this substance.

Data source

Reference Type:
review article or handbook
Chemistry of the Elements
Greenwood, N. N.; Earnshaw, N.
Bibliographic source:
Greenwood, N. N.; Earnshaw, N. Chemistry of the Elements, 2nd ed.; Pergamon Press, UK, 1997; pp 703.

Materials and methods

Results and discussion

Applicant's summary and conclusion

Test is not possible due to degradation in water.
Executive summary:

Test is not possible due to degradation of substance in water.