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Vapour pressure

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Reference
Endpoint:
vapour pressure
Type of information:
experimental study
Adequacy of study:
key study
Study period:
24 Jun - 22 Aug 2016
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
guideline study with acceptable restrictions
Reference:
Composition 0
Qualifier:
according to
Guideline:
EU Method A.4 (Vapour Pressure)
Deviations:
no
Qualifier:
according to
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
Deviations:
no
Qualifier:
according to
Guideline:
EPA OPPTS 830.7950 (Vapor Pressure)
Deviations:
no
GLP compliance:
yes
Type of method:
effusion method: isothermal thermogravimetry
Test material information:
Composition 1
Specific details on test material used for the study:
SOURCE OF TEST MATERIAL
- Source and lot/batch No.of test material: 605803
- Physical state: White waxy solid
- Analytical purity: 98.4%
- Expiration date of the lot/batch: 31 December 2016

STABILITY AND STORAGE CONDITIONS OF TEST MATERIAL
- Storage condition of test material: at room temperature
Key result
Temp.:
20 °C
Vapour pressure:
0.001 Pa
Remarks on result:
other: 5.4E-06 mm Hg
Temp.:
25 °C
Vapour pressure:
0.001 Pa
Remarks on result:
other: 9.3E-06 mm Hg

Linear regression analysis of log P(T,20) and log v(T,20) using the least squares method yielded an equation of log P(T) = 1.14 × log v(T) + 4.55. The coefficient of correlation (r) was > 0.99. This equation was used to determine log P(T) values for the test substance at elevated temperatures. Linear regression analysis of the log P(T) values and 1/T was performed using a least squares method. The vapour pressure of the test substance at 20°C and 25°C were determined using the vapour pressure regression curve. The equation of the curve was: log P(T) = -4095 ×1/T + 10.83 (r = 0.995, n = 6).

Conclusions:
The vapour pressure of MTDID 15670 is 7.2E-04 Pa (5.4E-06 mm Hg) at 20 °C and 1.2E-03 Pa (9.3E-06 mm Hg) at 25 °C as determined by EU Method A.4.
Executive summary:

The vapour pressure of the test substance was determined by the isothermal thermogravimetric effusion method. The weight loss of the sample was measured at three isothermal points between 140 and 170 °C. Weight loss rate at each temperature was converted to vapour pressure and entered into linear regression analysis vs. temperature. The resulting equation was log P(T) = -4095 ×1/T + 10.83 (r = 0.995). The calculated vapour pressures are therefore those of the subcooled liquid, with the solid having a lower vapour pressure. The test was done according to EU Method A.4 “Vapour pressure” and in accord with GLP guidelines; however due to the fact that the study was conducted above the substance melting point and provided the vapor pressure of the subcooled liquid rather than the solid material, the study is considered reliable with restrictions.

Description of key information

The vapour pressure of MTDID 15670 is 7.2E-04 Pa (5.4E-06 mm Hg) at 20 °C and 1.2E-03 Pa (9.3E-06 mm Hg) at 25 °C (EU Method A.4).

Key value for chemical safety assessment

Additional information

The vapour pressure of the test substance was determined by the isothermal thermogravimetric effusion method. The test was done according to EU Method A.4 “Vapour pressure” and in accord with GLP guidelines; however due to the fact that the study was conducted above the substance melting point and provided the vapour pressure of the subcooled liquid rather than the solid material, the study is considered reliable with restrictions.