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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Vapour pressure

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Reference
Endpoint:
vapour pressure
Type of information:
(Q)SAR
Adequacy of study:
key study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
accepted calculation method
Justification for type of information:
QSAR prediction
Principles of method if other than guideline:
Calculation based on MPBPWIN v1.43, Estimation Programs Interface Suite™ for Microsoft® Windows v4.10. US EPA, United States Environmental Protection Agency, Washington, DC, USA.
GLP compliance:
no
Type of method:
other: QSAR
Temp.:
20 °C
Vapour pressure:
<= 0 Pa
Remarks on result:
other: The calculation is based on the lowest possible boling temperature

Modified Grain method. QSAR result; transition/decomposition is not specified/reported. For detailed description of the model and its applicability, see "Any other information on materials and methods incl. tables”

Description of key information

=< 4.24E-5 Pa at 20 °C

Key value for chemical safety assessment

Vapour pressure:
0 Pa
at the temperature of:
20 °C

Additional information

The vapour pressure of the substance was determined with the use of Modified Grain-Watson estimation (MPBPWIN v1.43, Estimation Programs Interface Suite™ for Microsoft® Windows v4.10). The calculation is based on the lowest possible boiling temperature, which in fact is probably a decomposition temperature. In a peer reviewed SIDS Initial Assessment Profile for alkyl sulphates (structurally related to alcohols ethoxylated, sulphated; SIAM 25, 17 -18 October, 2007) it is stated that: "As ionic substances, all members of this category have extremely low vapour pressures. Calculated values are in the ranges 1E-11 hPa to 1E-15 hPa (C8 -18 alkyl sulphates) (...) Therefore, they decompose before reaching their theoretical boiling points". In addition, the melting temperature is above 280 °C. In this range, no experimental study needs to be conducted, and a limit value from a valid QSAR is sufficient. Thus, the obtained value should be considered an upper limit of the vapour pressure and accepted for the risk assessment calculations in the sense of a "worst-case scenario".