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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:
17 june 2019 - 04 July 2019
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
EU Method A.4 (Vapour Pressure)
Version / remarks:
2016
Deviations:
no
Qualifier:
according to guideline
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
Version / remarks:
2006
Deviations:
no
Qualifier:
according to guideline
Guideline:
EPA OPPTS 830.7950 (Vapor Pressure)
Version / remarks:
1996
Deviations:
no
GLP compliance:
yes
Type of method:
effusion method: isothermal thermogravimetry
Specific details on test material used for the study:
Boiling temp.: 245.8°C
Key result
Test no.:
#1
Temp.:
20 °C
Vapour pressure:
5.7 Pa
Key result
Test no.:
#2
Temp.:
25 °C
Vapour pressure:
9.5 Pa

Table: Results of the vapour pressure isothermal TGA analysis (substance)

Temperature
[°C]

Weight loss
[µg/min]

νT
[g/cm2/h]

logνT

logPT

PT
[Pa]

20

3.28375

3.92E-4

-3.41

0.75

5.6

 

3.81765

4.56E-4

-3.34

0.83

6.8

30

6.26056

7.47E-4

-3.13

1.10

13

 

7.52980

8.99E-4

-3.05

1.20

16

40

15.2549

1.82E-3

-2.74

1.59

39

 

15.4654

1.85E-3

-2.73

1.60

40

50

33.9331

4.05E-3

-2.39

2.03

1.1E2

 

32.9082

3.93E-3

-2.41

2.01

1.0E2

Conclusions:
The vapour pressure of the substance at 20°C and 25°C was determined to be 5.7 Pa and 9.5 Pa, resp.
Executive summary:

The vapour pressure of the substance was determined using the isothermal thermogravimetric effusion method in a GLP study based on EC A.4, OECD 104 and OPPTS 830.7950. Validation of the method was performed using a set of five reference substances.

The vapour pressure regression curve (log PT as function of 1/T; with T in K) of the substance was constructed from weight losses measured at 20°C, 30°C, 40°C and 50°C. The vapour pressure of the substance at 20°C and 25°C was calculated from the vapour pressure curve to be 5.7 Pa and 9.5 Pa, resp.

Description of key information

Vapour pressure at 25°C: 9.5 Pa (EC A.4, OECD 104, OPPTS 830.7950: isothermal thermogravimetric effusion)

Key value for chemical safety assessment

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

Additional information