Registration Dossier

Administrative data

stability: thermal, sunlight, metals, other
Stability as function of concentration
Type of information:
experimental study
Adequacy of study:
key study
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
test procedure in accordance with generally accepted scientific standards and described in sufficient detail

Data source

Reference Type:
study report

Materials and methods

Test guideline
no guideline available
GLP compliance:

Results and discussion

For thermal stability study

Test substance thermally stable:
Operating temperature
Operating temp.:
>= 30 - 260 °C
Transformation products:
Polymers of the substance

For study on stability to metals

Test substance stable to metals / metal ions:
not determined

Any other information on results incl. tables

In three experiments it was determined, whether it is possible to isolate waterfree substance from the solution. It was tried to evaporate the solution to remove the water at 50°C and 70°C.

It was shown, that the substance is not stable under these conditions. During the test at 50°C at 60 -70 mbar in a reasonable distillation time ca. 65 % of the water was distilled of.

It was found, that 26 % of the starting material has decomposed/polymerized. At 70°C ca. 45 % of the substance is lost.

A DSC-investigation showed, that the substance in solution is thermally not stable. At temperatures above 80°C exothermal reaction starts with an energy similar to that of a polymerization reaction

of an olefine.

Applicant's summary and conclusion

The substance as such cannot be isolated from the solution. Under the conditions applied in the tests a major amount of the substance converted into another substance, most likely polymer.
As a conclusion the water content is needed to stabilize the substance. The highest achieved concentration of the substance in the solution was ca.41 %, but under this conditions 26 % of
the substance was converted, which means that the substance identity (calculated as water free) does no longer meet the monoconstituent definition (< 74 % of sodium vinylsulfonate compared to
>= 92 in the starting solution).