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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
Remarks:
Guideline study performed in compliance with GLP, available as unpublished report, no restrictions, fully adequate for assessment.
Qualifier:
according to guideline
Guideline:
EU Method A.4 (Vapour Pressure)
Deviations:
no
GLP compliance:
yes
Type of method:
static method
Specific details on test material used for the study:
- Name of test material (as cited in study report): Tetrabenzylthiuram disulfide
- Substance type: Monoconstituent substance
- Physical state: Solid
- Storage condition of test material: At room temperature in the dark
- Lot/batch No.: RB82 + RB87 + RB88 + RB92 + RB69
Temp.:
ca. 37.7 °C
Vapour pressure:
3.32 Pa
Remarks on result:
other: Measurements no. 56 - 71
Temp.:
31.5 °C
Vapour pressure:
1.63 Pa
Remarks on result:
other: Measurements no. 28 - 53
Temp.:
ca. 24.8 °C
Vapour pressure:
0.85 Pa
Remarks on result:
other: Measurements no. 3 - 27
Temp.:
ca. 43.5 °C
Vapour pressure:
6.3 Pa
Remarks on result:
other: Measurements no. 74 - 88; because the test substance in concern did not behave ideally, measurements were performed at four, instead of at three different temperatures. Hence, the result obtained is more reliable.
Conclusions:
The vapour pressure of Tetrabenzylthiuram disulfide at 25 °C was interpolated to be 0.86 ± 0.04 Pa.
Executive summary:

The vapour pressure of a sample of Tetrabenzylthiuram disulfide was determined. Using the static technique, a vapour pressure of 0.86 ± 0.04 Pa at 25 °C was obtained. A continuous decline of the vapour pressure in time was observed during the measurements. Hence, the vapour pressure of Tetrabenzylthiuram disulfide was derived by extrapolating the curve of the natural logarithm of the measured vapour pressure (at each of the four temperatures of measurement) versus time, to the first measurement.

Description of key information

Using the static technique, a vapour pressure of 0.86 ± 0.04 Pa at 25°C was obtained.

Key value for chemical safety assessment

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

Additional information

A continuous decline of the vapour pressure in time was observed during the measurements. Hence, the vapour pressure of Tetrabenzylthiuram disulfide was derived by extrapolating the curve of the natural logarithm of the measured vapour pressure (at each of the four temperatures of measurement) versus time, to the first measurement.

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