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Physical & Chemical properties

Vapour pressure

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Reference
Endpoint:
vapour pressure
Type of information:
experimental study
Adequacy of study:
key study
Study period:
2015
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Remarks:
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:
other: OECD Test Guideline 113 (1981) Screening Test for Thermal Stability and Stability in Air
Deviations:
not specified
Qualifier:
equivalent or similar to
Guideline:
EPA OPPTS 830.7950 (Vapor Pressure)
Deviations:
no
GLP compliance:
yes (incl. certificate)
Remarks:
inspected January 2013; signature: March 2013
Type of method:
effusion method: by loss of weight or by trapping vaporisate
Remarks:
Effusion Method: Knudsen Cell
Temp.:
20 °C
Vapour pressure:
0.12 Pa
Temp.:
25 °C
Vapour pressure:
0.18 Pa
Temp.:
50 °C
Vapour pressure:
0.95 Pa

Thermal Stability

The DSC run in a closed glass crucible under an inert atmosphere was determined. In the temperature range of 190 – 300 °C an endothermic effect can be observed, no exothermic decomposition reaction were observed up to the maximum measured temperature of 300 °C.

 

Effusion method: Knudsen cell

The vapour pressure was measured in the temperature range of 10 to 40 °C. The measured vapour pressure values together with the measured temperatures are listed.

Table 1: Results of the Effusion method

No.

Temperature / °C

Vapour pressure / Pa

1

10

0.05

2

15

0.08

3

20

0.17

4

25

0.19

5

30

0.24

6

35

0.34

7

40

0.51

From the measured data points on the vapour pressure curve the measured constants A and B of the Antoine equation were determined as: A = 8.7012; B = -2819.27 and C = 273.15. The vapour pressure of the test item was calculated by extrapolation of the measured vapour pressure curve for the temperatures 20, 25 and 50 °C.

Conclusions:
The vapour pressure of the test substance was determined to be at 20°C: 0.12 Pa and at 25°C: 0.18 Pa respectively
Executive summary:

The vapour pressure was determined using by the Effusion Method: Knudsen Cell in EU Method A.4 and OECD TG 104. The vapour pressure of the test substance was calculated by interpolation and extrapolation of the measured vapour pressure curve for the temperatures 20, 25 and 50 °C. The vapour pressure of the test substance was determined to be at test substance was determined to be at 20°C: 0.12 Pa and at 25°C: 0.18 Pa respectively.

Description of key information

Vapour Pressure: 0.12 Pa at 20 °C and 0.18 Pa at 25 °C, EU Method A.4: Effusion Method: Knudsen Cell, 2016

Key value for chemical safety assessment

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

Additional information

The vapour pressure was determined using by the Effusion Method: Knudsen Cell in EU Method A.4 and OECD TG 104. The vapour pressure of the test substance was determined to be at test substance was determined to be at 20°C: 0.12 Pa and at 25°C: 0.18 Pa respectively.