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Vapour pressure

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Reference
Endpoint:
vapour pressure
Type of information:
experimental study
Adequacy of study:
key study
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:
OECD Guideline 104 (Vapour Pressure Curve)
Deviations:
no
Qualifier:
according to
Guideline:
EU Method A.4 (Vapour Pressure)
Deviations:
no
Qualifier:
according to
Guideline:
EPA OPPTS 830.7950 (Vapor Pressure)
Deviations:
no
GLP compliance:
yes (incl. certificate)
Remarks:
inspected: September 2015; signature: November 2015
Type of method:
effusion method: isothermal thermogravimetry
Test no.:
#1
Temp.:
20 °C
Vapour pressure:
0.011 Pa
Test no.:
#2
Temp.:
25 °C
Vapour pressure:
0.021 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: Results of the isothermal TGA analysis

Temperature
[°C]

Weight loss
[µg/min]

νT
[g/cm2/h]

log νT

log PT

PT
[Pa]

60

1.19053

1.42´10-4

-3.85

0.21

1.6

 

1.18498

1.41´10-4

-3.85

0.21

1.6

70

2.78110

3.32´10-4

-3.48

0.68

4.8

 

2.76991

3.31´10-4

-3.48

0.68

4.8

80

6.15794

7.35´10-4

-3.13

1.13

13

 

6.13963

7.33´10-4

-3.13

1.12

13

90

12.8712

1.54´10-3

-2.81

1.54

34

 

12.8745

1.54´10-3

-2.81

1.54

34

 

Table 2: Vapour pressure of the test item

Temperature
[°C]

log PT

PT
[Pa]

PT
[mm Hg]

20

-1.98

1.1´10-2

7.9´10-5

25

-1.67

2.1´10-2

1.6´10-4

 

The plot of the log PT of the test item as function of the reciprocal temperatures was performed. The equation of the curve was: log PT,20 = -5345 × 1/T + 16.3 (r = 0.99998, n = 8).

Conclusions:
The vapour pressure of the test item was determined to be 0.011 Pa at 20°C (293K) and 0.021 Pa at 25°C (298K), respectively.
Executive summary:

The vapour pressure was determined using the thermogravimetric effusion method in OECD TG 104, EU Method A.4 and US EPA OPPTS 830.7950 under GLP. The vapour pressure of the test item was determined to be: 0.011 Pa (7.9 x10^-5 mmHg) at 20°C (293K) and 0.021 Pa (1.6 x10^-4 mmHg) at 25°C (298K), respectively.

Description of key information

Vapour Pressure: 0.021 Pa at 25 °C, OECD TG 104 - thermogravimetric effusion method, 2017

Key value for chemical safety assessment

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

Additional information

The vapour pressure was determined using the thermogravimetric effusion method in OECD TG 104, EU Method A.4 and US EPA OPPTS 830.7950 under GLP. The vapour pressure of the test item was determined to be: 0.011 Pa (7.9 x10^-5 mmHg) at 20°C (293K) and 0.021 Pa (1.6 x10^-4 mmHg) at 25°C (298K), respectively.