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Vapour pressure

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Reference
Endpoint:
vapour pressure
Type of information:
experimental study
Adequacy of study:
key study
Study period:
2014
Reliability:
1 (reliable without restriction)
Principles of method if other than guideline:
Vapor pressure measurements of unstable substances are performed with vacuum DSC
GLP compliance:
no
Remarks:
ISO 9001
Type of method:
other: vacuum DSC
Temp.:
35.8 °C
Vapour pressure:
2.55 mBar
Temp.:
43.9 °C
Vapour pressure:
2.49 mBar
Temp.:
64.3 °C
Vapour pressure:
11.1 mBar
Temp.:
90.4 °C
Vapour pressure:
112 mBar
Temp.:
25 °C
Vapour pressure:
0.66 mBar
Remarks on result:
other: extrapolated, in line with pure Spirdane D60 vapor pressure; corresponds to 66 Pa

Sample in a pan with a pierced lid is heated up with a rate of 5°C/min. at a reduced pressure. A fast evaporation of the sample is observed at its boiling point. This temperature corresponds with the saturated vapour pressure of the mixture at that typical reduced pressure. DSC tests were carried out at three different pressure levels. The Tx 501-CS40 samples give a weak endothermic effect. This is caused by evaporation of a mixture of several components. Pure one-component liquids give a sharp evaporation peak. A liquid mixture gives an evaporation range and a pure liquid gives a boiling point. A temperature calibration is carried out at the different pressure levels. The result of the calibration is a ‘delta-T’ correction that corresponds with the so called tau-lag at each different pressure level. Results of the tests are given in the attached table. The vapor pressure, in the range of 35 oC to 90 oC is given by the Clausius-Clapeyron equation: ln P = -8.0969*(1000/T)+26.74 (P in mBar, T in K). The limited number of data points is insufficient to fit the data in the Antoine equation.

Conclusions:
The vapor pressure of Trigonox 501-CS40 is 66 Pa @ 25 oC (extrapolated from data measured at 35.8-90.4 oC, in line with vapor pressure of pure Spirdane D60)
Executive summary:

The vapor pressure of Trigonox 501-CS40 is 66 Pa @ 25 oC (extrapolated from data measured at 35.8-90.4 oC, in line with vapor pressure of pure Spirdane D60)

Description of key information

The vapor pressure of Trigonox 501-CS40 is 66 Pa @ 25 oC (extrapolated from data measured at 35.8-90.4 oC, in line with vapor pressure of pure Spirdane D60)

Key value for chemical safety assessment

Vapour pressure:
66 Pa
at the temperature of:
25 °C

Additional information