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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
Qualifier:
according to
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
GLP compliance:
yes (incl. certificate)
Type of method:
effusion method: by loss of weight or by trapping vaporisate
Key result
Temp.:
20 °C
Vapour pressure:
0 hPa
Remarks on result:
other: extrapolated
Key result
Temp.:
25 °C
Vapour pressure:
0 hPa
Remarks on result:
other: extrapolated
Temp.:
50 °C
Vapour pressure:
0.001 hPa
Remarks on result:
other: intrapolated
Key result
Vapour pressure:
0.001 hPa
Remarks on result:
other: intrapolated

Results

 Temperature [°C]     Vapour pressure curve [p/hPa]   
 Cell 13  Cell 15
 53.5  1.07e-03  1.20e-03
 53.4  1.01e-03  1.08e-03
 41.7  3.69e-04*  3.85e-04*
 41.6  2.19e-04  2.38e-04
 41.6  2.97e-04  2.94e-04
 30.8  6.59e-05  8.37e-05

*Values are not used for calculation of regression curve#

In the temperature range used for vapor pressure measurements the test item was liquid. Vapor pressures were calculated using a molar mass of 252.2 g/mol. The regression of the vapor pressure data leads with a mean deviation of 9.57% to the following equation:

ln (p/hPa) = 29.6507- 11916.42 / (273.15+t/°C)

The vapor pressures of the following table were calculated from the regression equation.

 Temperature [°C]  Vapour pressure [hPa]
 20  1.7e-05
 25  3.3 -05
 50  7.3e-04
Conclusions:
The vapour pressure of trimethyl benzene-1,2,4-tricarboxylate was estimated to be, by extrapolation at 25 deg C of experimental results: VP = 3.3E-5 hPa, equivalent to 2.48E-5 mmHg
Executive summary:

The vapour pressure of trimethyl benzene-1,2,4-tricarboxylate was estimated to be, by extrapolation at 25 deg C of experimental results: VP = 3.3E-5 hPa, equivalent to 2.48E-5 mmHg

Description of key information

Vapour pressure: 3.3E-5 hPa at 25 deg C.

Key value for chemical safety assessment

Vapour pressure:
0 hPa
at the temperature of:
25 °C

Additional information

The vapour pressure of trimethyl benzene-1,2,4-tricarboxylate was estimated to be, by extrapolation at 25 deg C of experimental results: VP = 3.3E-5 hPa, equivalent to 2.48E-5 mmHg