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EC number: 204-112-2 | CAS number: 115-86-6
Vapour pressure
Administrative data
Link to relevant study record(s)
- Endpoint:
- vapour pressure
- Type of information:
- calculation (if not (Q)SAR)
- Adequacy of study:
- key study
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- other: Publication in peer reviewed journal - Accepted calculation method (also assessed by OECD)
- Qualifier:
- no guideline followed
- Principles of method if other than guideline:
- Measured using a coventional isoteniscope under a nitrogen atmosphere to exclude the possibility of oxidative degradation
- GLP compliance:
- not specified
- Type of method:
- isoteniscope
- Specific details on test material used for the study:
- Purified by recrystallisation from methanol
- Temp.:
- 25 °C
- Vapour pressure:
- 0.001 Pa
- Remarks on result:
- other: 6.4E-06 torr
- Temp.:
- 40 °C
- Vapour pressure:
- 0.004 Pa
- Remarks on result:
- other: 3.1E-05 torr
- Temp.:
- 60 °C
- Vapour pressure:
- 0.027 Pa
- Remarks on result:
- other: 2.0E-04 torr
- Temp.:
- 100 °C
- Vapour pressure:
- 0.627 Pa
- Remarks on result:
- other: 4.7E-03 torr
- Temp.:
- 180 °C
- Vapour pressure:
- 64.49 Pa
- Remarks on result:
- other: 0.48 torr
- Temp.:
- 225 °C
- Vapour pressure:
- 454 Pa
- Remarks on result:
- other: 3.4 torr
- Temp.:
- 255 °C
- Vapour pressure:
- 1 388 Pa
- Remarks on result:
- other: 10.4 torr
- Temp.:
- 300 °C
- Vapour pressure:
- 5 950 Pa
- Remarks on result:
- other: 44.6 torr
- Transition / decomposition:
- yes
- Remarks:
- decomposition
- Transition temp.:
- > 410 °C
- Conclusions:
- Vapour pressure measurements fitted the Clausius-Clapeyron equation logP (torr) = -A/T (K)+ C where A = 4253, T = temperature in Kelvin and C = 9.07 . Vapour pressure at 25 °C is 8.53E-04 Pa.
- Executive summary:
Vapour pressure measurements fitted the Clausius-Clapeyron equation logP (torr) = -A/T (K) + C where A = 4253, T = temperature in Kelvin and C = 9.07. Vapour pressure at 25 °C is 8.53E-04 Pa.
Reference
Description of key information
The vapour pressure of 8.53E-04 Pa has been extrapolated for TPP by Dobry and Keller (1957).
Key value for chemical safety assessment
- Vapour pressure:
- 0.001 Pa
- at the temperature of:
- 25 °C
Additional information
Results from the Clausius-Clapeyron equation as measured by Dobry & Keller (1957) are consistent with those provided in Perry & Green (1984). A value of 8.53E-04 Pa has been extrapolated for TPP at 25 °C by Dobry & Keller (1957). Results from other sources are in line with these figures and show that TPP has a very low vapour pressure under ambient conditions.
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