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Physical & Chemical properties

Vapour pressure

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Reference
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.

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.