Registration Dossier
Registration Dossier
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EC number: 470-470-3 | CAS number: 9022-75-7
Vapour pressure
Administrative data
Link to relevant study record(s)
Description of key information
The vapour pressure of the constituents/impurity of the substance (3 components of the substance covering 86.9% of the composition) are in the range between 8.38.10 -4 and 9.05.10 -8 Pa (valid QSAR estimations).
A key value was calculated for the purpose of CSA as 5.83.10 -4 Pa at 25°C as the sum of the partial pressure of known constituents/impurity of the substance (molar fraction)
Key value for chemical safety assessment
- Vapour pressure:
- 0.001 Pa
- at the temperature of:
- 25 °C
Additional information
An experimental study was conducted on the test item itself.
However, the result of the study is considered as not reliable due to methodology deficiency and considering that decomposition of the registered substance cannot be exclude during the test.
In addition, under the test conditions, the vapour of the substance was found to be 227 Pa at 250°C while the vapour pressure of the substance is expected to be below 0.049 Pa (Vapour pressure of dodecanol).
Thus, the measure of the true initial boiling point of the substance is considered as difficult and the experimental study was considered as unreliable.
That is why this study was disregarded.
The test item is a mixture of several constituents, but 3 of them represent 86.9% of that mixture.
A calculation method was used to predict the endpoint value of the major constituents/ipurity of the substance which would be expected when testing a pure substance under experimental conditions in a laboratory following Guideline for Testing of Chemicals No. 104. The criterion predicted was the vapour pressure in Pa at 25°C.
The vapour pressures of the constituents/impurity of the substance were estimated at 25°C as follows:
Constituents |
vapour pressure (Pa) at 25 °C |
95% confidence limits (Pa) |
Constituent 1 |
8.38.10 -4 |
4.12.10 -4 – 1.70.10 -3 |
Constituent 2 |
8.71.10 -6 |
3.2.10 -6 – 2.37.10 -5 |
Constituent 3 |
9.05.10 -8 |
2.48.10 -8 – 3.31.10 -7 |
The constituents/impurity of the substance have different vapour pressures and we can not anticipate the impact of the interactions between the constituents and the influence of the physical state of the substance on the whole substance vapour pressure.
However, for the purpose of CSA, the VP of the substance was calculated as the sum of the partial pressure of known constituents/impurity of the substance (molar fraction), based on the following typical composition:
Constituent 1 : 54.7 %w/w, i.e. 69.35%mol
Constituent 2 : 25.9 %w/w, i.e. 25.56%mol
Constituent 3 : 6.3 %w/w,i.e. 5.09%mol
Finally a Vapour pressure of 5.83.10 -4 Pa at 25°C has been considered as key value for purpose of CSA.
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.
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