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Vapour pressure

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Reference
Endpoint:
vapour pressure
Type of information:
experimental study
Adequacy of study:
key study
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Reason / purpose:
reference to same study
Reason / purpose:
reference to same study
Reason / purpose:
reference to same study
Reason / purpose:
reference to same study
Reason / purpose:
reference to same study
Qualifier:
according to
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
Version / remarks:
2006
Qualifier:
according to
Guideline:
EU Method A.4 (Vapour Pressure)
Version / remarks:
2016
Qualifier:
according to
Guideline:
EPA OPPTS 830.7950 (Vapor Pressure)
Version / remarks:
1996
GLP compliance:
yes
Type of method:
effusion method: isothermal thermogravimetry
Specific details on test material used for the study:
Clear colourless liquid
Purity: 97.2%
Test no.:
#1
Temp.:
20 °C
Vapour pressure:
0.06 Pa
Test no.:
#2
Temp.:
25 °C
Vapour pressure:
0.1 Pa

The vapour pressure regression curve constructed using the data of Experiment 1 and Experiment 2 had a coefficient of correlation of <0.99 due to weight loss while being stored in the auto-sampler. Therefore, it was decided to perform a third experiment and to calculate the coefficient of correlation for the Experiment 1/Experiment 2/Experiment 3, Experiment 1/Experiment 2 and Experiment 1/Experiment 3. Coefficient of correlation was >0.99 for the Experiment 1/Experiment 3. Based on this, the results from Experiment 2 were excluded.

Conclusions:
The isothermal TGA effusion method was applied for the determination of the vapour pressure of 1,1’-(1,1,3-trimethylpropane-1,3-diyl)bis(cyclohexane). The vapour pressure of the test item was 0.06 Pa (4.5 x 10E-4 mm Hg) at 20°C (293K) and 0.10 Pa (7.9 x 10E-4 mm Hg) at 25°C (298K).
Executive summary:

The isothermal TGA effusion method was applied for the determination of the vapour pressure of 1,1’-(1,1,3-trimethylpropane-1,3-diyl)bis(cyclohexane). The vapour pressure of the test item was 0.06 Pa (4.5 x 10E-4 mm Hg) at 20°C (293K) and 0.10 Pa (7.9 x 10E-4 mm Hg) at 25°C (298K).

Description of key information

The isothermal TGA effusion method was applied for the determination of the vapour pressure of 1,1’-(1,1,3-trimethylpropane-1,3-diyl)bis(cyclohexane). The vapour pressure of the test item was 0.06 Pa (4.5 x 10E-4 mm Hg) at 20°C (293K) and 0.10 Pa (7.9 x 10E-4 mm Hg) at 25°C (298K).

Key value for chemical safety assessment

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

Additional information