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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:
2016
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:
according to
Guideline:
EPA OPPTS 830.7950 (Vapor Pressure)
Deviations:
no
GLP compliance:
yes
Type of method:
effusion method: by loss of weight or by trapping vaporisate
Temp.:
20 °C
Vapour pressure:
0.66 Pa
Temp.:
20 °C
Vapour pressure:
0.005 mm Hg
Temp.:
25 °C
Vapour pressure:
1.2 Pa
Temp.:
25 °C
Vapour pressure:
0.009 mm Hg

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

 

Table 1: Results of the isothermal TGA analysis

Temperature [°C]

Weight loss [µg/min]

νT [g/cm2/h]

log νT

log PT

PT [Pa]

 

 

 

 

 

 

45

6.383

7.62´10^-4

- 3.12

0.99

9.8

 

8.552

1.02´10^-3

- 2.99

1.14

14

 

7.522

8.98´10^-4

-3.05

1.07

12

 

 

 

 

 

 

50

10.94

1.31´10^-3

-2.88

1.26

18

 

12.93

1.54´10^-3

-2.81

1.34

22

 

11.84

1.41´10^-3

-2.85

1.30

20

 

 

 

 

 

 

55

17.17

2.05´10^-3

-2.69

1.48

30

 

19.59

2.34´10^-3

-2.63

1.55

35

 

18.19

2.17´10-3

-2.66

1.51

33

 

 

 

 

 

 

60

27.19

3.25´10^-3

-2.49

1.71

52

 

29.61

3.53´10^-3

-2.45

1.75

57

 

28.00

3.34´10^-3

-2.48

1.73

53

 

 

 

 

 

 

 

Table 2: Vapour pressure of the test substance

 

20°C [Pa]

[mm Hg]

25°C [Pa]

[mm Hg]

Test item

0.66

4.9x10^-3

1.20

9.1x10^-3

 

The plot of the log PT of the test substance as function of the reciprocal temperatures was performed. The equation of the curve was: log PT = -4677 x 1/T + 15.77 (r = 0.988, n = 12).

Conclusions:
The vapour pressure of the test substance was determined to be at 20°C (293K): 0.66 Pa and at 25°C (298K): 1.20 Pa respectively
Executive summary:

The vapour pressure was determined using by thermogravic effusion method in EU Method A.4, OECD TG 104 and US EPA OPPTS 830.7950. The vapour pressure of the test substance was determined to be at 20°C (293K): 0.66 Pa (4.1 x10^-3 mmHg) and at 25°C (298K): 1.20 Pa (9.1x10^-3 mmHg) respectively.

Description of key information

Vapour Pressure: 0.66 Pa at 20 °C and 1.20 Pa at 25 °C, EU Method A.4, 2016

Key value for chemical safety assessment

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

Additional information

The vapour pressure was determined using by thermogravic effusion method in EU Method A.4, OECD TG 104 and US EPA OPPTS 830.7950. The vapour pressure of the test substance was determined to be at 20°C (293K): 0.66 Pa (4.1 x10^-3 mmHg) and at 25°C (298K): 1.20 Pa (9.1x10^-3 mmHg) respectively.