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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:
23-07-2019 to 13-08-2019
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: Guideline study performed under GLP. All relevant validity criteria were met.
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:
equivalent or similar to
Guideline:
EPA OPPTS 830.7950 (Vapor Pressure)
Deviations:
no
GLP compliance:
yes
Type of method:
effusion method: isothermal thermogravimetry
Test no.:
#1
Temp.:
20 °C
Vapour pressure:
0.82 Pa
Test no.:
#1
Temp.:
25 °C
Vapour pressure:
1.5 Pa

The results of the isothermal TGA analysis for the test item and the vapour pressure at 20°C and 25°C are given in the following tables.

 

Table 1.0: Results of the isothermal TGA analysis

Experiment

Temperature
[°C]

Weight loss
[µg/min]

νT
[g/cm2/h]

log νT

log PT

PT
[Pa]

1 #1

30

2.42397

2.89 x 10-4

-3.54

0.58

3.8

 

40

5.65378

6.75 x 10-4

-3.17

1.05

11

 

50

12.51150

1.49 x 10-3

-2.83

1.48

30

 

60

26.0644

3.11 x 10-3

-2.51

1.89

77

2

30

1.90374

2.27 x 10-4

-3.64

0.45

2.8

 

40

4.28420

5.11 x 10-4

-3.29

0.89

7.8

 

50

9.46734

1.13 x 10-3

-2.95

1.33

21

 

60

19.4442

2.32 x 10-3

-2.63

1.72

53

3

30

1.63170

1.95 x 10-4

-3.71

0.36

2.3

 

40

4.16279

4.97 x 10-4

-3.30

0.88

7.5

 

50

9.06006

1.08 x 10-3

-2.97

1.30

20

 

60

19.3503

2.31 x 10-3

-2.64

1.72

53

where:

#1 : Experiment 1 was not used in further calculations.

Table 2.0 - Vapour Pressure of the test item

Temperature
[°C]

log PT

PT
[Pa]

PT
[mm Hg]

20

-0.09

0.82

6.1x10-3

25

0.17

1.5

1.1x10-2

Conclusions:
The vapour pressure of the test item was determined to be 0.82 Pa at 20°C and 1.5 Pa at 25°C, respectively.
Executive summary:

The vapour pressure was determined according to EU Method A.4 and OECD TG 104 using the thermogravimetric effusion method under GLP. The vapour pressure of the test item was determined to be 0.82 Pa (6.1x 10^-3 mm Hg) at 20°C, and 1.5 Pa (1.1x10^-2 mm Hg) at 25°C.

Description of key information

Vapour Pressure: 1.5 Pa at 25 °C (mean, n=3), EU Method A.4 - thermogravimetric effusion method, 2019

Key value for chemical safety assessment

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

Additional information

Key study : EU Method A.4, 2019 : The vapour pressure was determined according to EU Method A.4 and OECD TG 104 using the thermogravimetric effusion method under GLP. The vapour pressure of the test item was determined to be 0.82 Pa (6.1x 10^-3 mm Hg) at 20°C, and 1.5 Pa (1.1x10^-2 mm Hg) at 25°C.