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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:
from 05 July 2017 to 06 July 2017
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to
Guideline:
EU Method A.4 (Vapour Pressure)
Version / remarks:
2009
Deviations:
no
Qualifier:
according to
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
Version / remarks:
2006
Deviations:
no
Qualifier:
according to
Guideline:
EPA OPPTS 830.7950 (Vapor Pressure)
Version / remarks:
1996
Deviations:
no
GLP compliance:
yes (incl. certificate)
Type of method:
effusion method: isothermal thermogravimetry
Key result
Temp.:
25 °C
Vapour pressure:
0 Pa
Key result
Temp.:
20 °C
Vapour pressure:
0 Pa

Table: Results of the isothermal TGA analysis (test substance)

 

Experiment

Temperature
[°C]

Weight loss [µg/min]

vT [g/cm2/h]

log vT

log PT

PT
[Pa]

A

170

8.60725

1.03E-03

-2.99

1.22

17

 

180

12.7354

1.52E-03

-2.82

1.43

27

 

190

22.9053

2.73E-03

-2.56

1.75

57

B

170

7.81883

9.33E-03

-3.03

1.17

15

 

175

9.96265

1.19E-03

-2.92

1.30

20

 

180

13.5559

1.62E-03

-2.79

1.47

29

Weight loss curve of Experiment A: see picture below.

Conclusions:
Under the study conditions, the vapour pressure of the test substance was determined to be 3.8E-06 Pa at 20°C and 8.0E-06 Pa at 25°C.
Executive summary:

A stuyd was conducted to determine the vapour pressure of the test substance, Oleyl TMAC, using the isothermal thermogravimetric effusion method, according to EU Method A.4, OECD Guideline 104 and EPA Guideline OPPTS 830.7950, in compliance with GLP. A vapour pressure curve was constructed from duplicate measurements at temperatures between 170°C and 190°C. Under the study conditions, the vapour pressure of the substance at 25°C and at 20°C was determined by extrapolation to be 8.0E-06 Pa and 3.8E-06 Pa, respectively (Reingruber, 2017).

Description of key information

Vapour pressure was determined using the isothermal thermogravimetric effusion method, according to EU Method A.4, OECD Guideline 104 and EPA Guideline OPPTS 830.7950 (Reingruber, 2017).

Key value for chemical safety assessment

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

Additional information

(3.8E-06 Pa at 20°C)