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EC number: 211-989-5
CAS number: 732-26-3
The vapour pressure of the test material was determined to be 3.5 x 10^-2 Pa (2.6 x 10^-4 mm Hg) at 20 °C, and 7.3 x 10^-2 Pa (5.5 x 10^-4 mm Hg) at 25 °C.
There are three studies available to address this endpoint, one key and
The key study, the vapour pressure of the test material has
been investigated in a study which was performed under GLP conditions
and in accordance with the standardised guidelines OECD 104, EU Method
A.4 and US EPA OPPTS 830.7950. The study has been awarded a
reliability score of 1 in accordance with the criteria set forth by
Klimisch et al. (1997).
A suspension of the test material in n-hexane was applied to the surface
of a roughened glass plate as a homogeneous layer. The plate was dried
at 30 °C under nitrogen in the thermogravimetric analyser (TGA). The
amount of dried test material was 14.8 or 15.2 mg.
The weight loss of the test material was measured continuously as a
function of time at defined isothermal temperatures. The evaporation
rate of the test material (VT) was calculated from the weight loss of
the compound. The PT values at the defined isothermal temperatures were
determined using the vapour pressure equation with constants specific
for the experimental arrangement. Linear regression analysis of the log
PT values and 1/T was performed using a least squares method. The PT
values of the test material at 20 and 25 °C were determined using the
vapour pressure regression curve.
The experiments were performed under a flow of nitrogen and at
Under the conditions of the study, the vapour pressure of the test
material was determined to be 3.5 x 10^-2 Pa (2.6 x 10^-4 mm Hg) at 20
°C, and 7.3 x 10^-2 Pa (5.5 x 10^-4 mm Hg) at 25 °C.
In the first suppoting study, the vapour pressure of the test
material was estimated using the MPBPWIN model v1.43 (EPI Suite v4.11). The
study was awarded a reliability score of 2 in accordance with the
criteria set forth by Klimisch et al. (1997).
The MPBPWIN model estimates the vapour pressure of a substance
using three models: the Antoine Method (applicable to gases and
liquids); the Modified Grain Method (applicable to solids, liquids and
gases); and the Mackay Method (applicable to aliphatic and aromatic
hydrocarbons and also halogenated aliphatic and aromatic compounds).
The suggested vapour pressure of solids is given as the Modified
Grain Method. Due to the limited applicability of the Mackay Method,
this is not suggested as the selected vapour pressure by the MPBPWIN
model. The molecular weight of the test material is within the training
The vapour pressure was calculated to be 0.0266 Pa at 25 °C and
0.0002 mm Hg at 25 °C (Modified Grain Method).
The second supporting study was awarded a reliability score of 4
in accordance with the criteria set forth by Klimisch et al. (1997). In
this study there is a value quoted for the vapour pressure of the test
material in the US HPV submission relating to the alkyl phenols. The HPV
document makes reference to the fact that the value was obtained from
Perry’s Chemical Engineers Handbook, 6th Ed. However, at the time of
submission it had not been possible to obtain the original reference.
Therefore no further data is available in relation to the value obtained.
The vapour pressure of the test material was quoted as 0.088 Pa at
25 °C (0.000661 mm Hg at 25 °C).
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.
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