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Physical & Chemical properties

Vapour pressure

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Reference
Endpoint:
vapour pressure
Type of information:
experimental study
Adequacy of study:
key study
Study period:
23.01.2018-15.03.2018
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
Version / remarks:
effusion method: Knudsen Cell
Deviations:
no
Qualifier:
according to guideline
Guideline:
EU Method A.4 (Vapour Pressure)
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Type of method:
effusion method: Knudsen cell
Specific details on test material used for the study:
Name: Pentaerythritol tetrabenzoate
Appearance: off-white solid
Composition: Pentaerythritol tetrabenzoate >96%
CAS No.: 4196-86-5
EINECS-No.: 224-079-8
Molecular formula: C33H28O8
Molecular weight: 552.576 g/mol
Purity: >96%
Homogeneity: homogeneous
Expiry date: Nov. 2018
Storage: Room Temperature (20 ± 5°C)
Key result
Test no.:
#1
Temp.:
ca. 393.2 K
Vapour pressure:
ca. 0.001 Pa
Remarks on result:
other: Stand Dev. 8.37E-05
Key result
Test no.:
#2
Temp.:
ca. 408.2 K
Vapour pressure:
ca. 0.002 Pa
Remarks on result:
other: Stand Dev. 4.29E-04
Key result
Test no.:
#3
Temp.:
ca. 408.2 K
Vapour pressure:
ca. 0.005 Pa
Remarks on result:
other: Stand. Dev. 1.02E-03
Transition / decomposition:
no

The following vapour pressures were determined experimentally and considered as valid (mean and standard deviation given):

Experimentally Determined Vapour Pressures

 T  T  p  Stand. Dev. p  RSD p
 °C  K  Pa  Pa  %
 120.0  393.2  6.27E-04  8.37E-05  13.4%
 135.0  408.2  1.66E-03  4.29E-04  25.9%
 150.0  423.2  4.69E-03  1.02E-03  21.7%

For the test item Pentaerythritol tetrabenzoate, the following vapour pressures at 20°C and at 25°C were calculated from the regression equation:

Vapour pressure at 20°C: 3.84 * 10-08 Pa

Vapour pressure at 25°C: 7.27 * 10-08 Pa

The linear regression of log p vs. 1/T gave a correlation coefficient r of - 0.9991, showing good repeatability and precision. Therefore, the determination is considered as valid.

For Diethylphthalate the following vapour pressure was determined and compared with recommended value:

Vapour pressure (positive control) at 30°C: 1.60*10-1 Pa

Criterion for the vapour pressure of the positive control at 30°C 0.44*10-1 - 2.44*10-1 Pa

The vapour pressure met the validity criteria. Therefore, the study can be considered as valid.

Conclusions:
For the test item Pentaerythritol tetrabenzoate, the following vapour pressures at 20°C and at 25°C were calculated from the regression equation:
Table 10.1-b Results Test ItemVapour pressure at 20°C: 3.84 * 10-08 Pa
Vapour pressure at 25°C: 7.27 * 10-08 Pa
Executive summary:

The vapour pressure of Pentaerythritol tetrabenzoate was determined according to OECD 104 resp. EU A.4 using the effusion method (weight loss). Vapour pressure was examined at nine different temperatures. Three temperatures could be evaluated as they showed reproducible weight loss. For these temperatures, 1/T was plotted against log (p).

The graph 1/T vs. log (P) shows a straight line with a correlation coefficient of - 0.9991. For the test item Pentaerythritol tetrabenzoate, the following vapour pressures at 20 °C and

at 25 °C were calculated from the regression equation:

Vapour pressure at 20 °C: 3.84 * 10-08Pa

Vapour pressure at 25 °C: 7.27 * 10-08Pa

Description of key information

The vapour pressure of Pentaerythritol tetrabenzoate was determined according to OECD 104 resp. EU A.4 using the effusion method (weight loss). Vapour pressure was examined at nine different temperatures. Three temperatures could be evaluated as they showed reproducible weight loss. For these temperatures, 1/T was plotted against log (p).

The graph 1/T vs. log (P) shows a straight line with a correlation coefficient of - 0.9991. For the test item Pentaerythritol tetrabenzoate, the following vapour pressures at 20 °C and

at 25 °C were calculated from the regression equation:

Vapour pressure at 20 °C: 3.84 * 10-08Pa

Vapour pressure at 25 °C: 7.27 * 10-08Pa

Key value for chemical safety assessment

Vapour pressure:
0 Pa
at the temperature of:
20 °C

Additional information