Registration Dossier
Registration Dossier
Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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.
Use of this information is subject to copyright laws and may require the permission of the owner of the information, as described in the ECHA Legal Notice.
EC number: 916-461-4 | CAS number: -
Vapour pressure
Administrative data
Link to relevant study record(s)
Description of key information
Waiving.
Key value for chemical safety assessment
- Vapour pressure:
- 0.015 Pa
- at the temperature of:
- 25 °C
Additional information
The substance contains a significant amount of water and butyltriglycol as additives. Vapour pressures of pure components at 25 °C are:
- water ca. 3169 Pa;
- butyltriglycol ca. 0.33 Pa;
- sulphonatophatalate derivatives of C12 alcohol ca. 3 × 10-13 Pa (estimated by EPISuite);
- sulphotalic acid, trisodium salt ca. 8.3 × 10 -10 Pa (estimated by EPISuite);
- C12 alcohol ca. 0.11 Pa;
- sulphonatophtalate derivatives of C14 alcohol ca. 3 × 10 -13 Pa (estimated by EPISuite);
- C14 alcohol ca. 0.015 Pa;
- sodium acetate c. 7.2 × 10 -7 Pa (ECHA database).
Chemical interactions among molecules may significantly influence the vapour pressure of different components compared to the pure species. However, water is expected to have the major impact on vapour pressure the substance and the vapour phase will mainly contain water.
Moreover, by assuming an ideal behaviour of liquids, the Raoult's law can be applied to estimate partial vapour pressures depending on a typical composition of the substance. In particular based on the composiiton reported in section 1.4, a major contribution in terms of partial pressure is due to water, i.e. 2929 Pa. Partial pressure of other components are of 0.0124 Pa for butyltriglycol, 0.0003 Pa for C12 alcohol, 0.00001 Pa for C14 alcohol. Contributions of other species are considered as negligible.
The assumption of ideal behaviour may only provide a qualitative estimate; however, as the molar fraction of water is close to 1, i.e. > 0.92, and the molar fraction of the second most abundant species is < 0.04, no significant impact of positive and negative deviations compared to the Raoult's law is expected. Overall, based on composition of the substance and vapour pressure of each component, a value of ca. 0.015 Pa for all species except for water was used for the chemical safety assessment.
In conclusion, a study of vapour pressure was considered as not scientifically relevant due to the high content of water.
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.
Reproduction or further distribution of this information may be subject to copyright protection. Use of the information without obtaining the permission from the owner(s) of the respective information might violate the rights of the owner.
