Registration Dossier
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EC number: 931-974-3 | CAS number: 1231880-35-5
Vapour pressure
Administrative data
Link to relevant study record(s)
Description of key information
The vapour pressure is < 0.18 Pa at 25 °C (estimation method).
Key value for chemical safety assessment
- Vapour pressure:
- 0.18 Pa
- at the temperature of:
- 25 °C
Additional information
The test substance was investigated using the static method. The result was < 5 Pa at two temperatures: 20 and 50 °C.
Since the data for the test substace C12-13 were obtained for a high water content (ca. 73%) formulation, the value of vapour pressure was estimated in a weight of evidence approach, including data for read-across substances sulfuric acid, mono-C12-14-alkyl (even numbered) esters, sodium salts, and sodium dodecyl sulphate.
According to the theoretical principle of Raoult’s law, the vapour pressure of a mixture is equal to the mole-fraction-weighted sum of the components' vapour pressures:
ptot= ∑ pixi
The vapour pressure of a mixture should be lower than the vapour pressure of the component which has the highest vapour pressure in its pure form.
Therefore the vapour pressure of Sulfuric acid, mono-C12-13 branched & linear alkyl esters, sodium salts should be lower than the vapour pressure of sodium dodecyl sulphate C12. This is why the value for C12 (< 0.18 Pa) is more reliable than the value obtained for C12-13 (high water content formulation) and the one calculated for C12-14 (< 97 Pa), also used in the weight of evidence approach. This value was selected for chemical safety assessment.
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