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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:
08 August 2018
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
Version / remarks:
2006
Deviations:
no
Qualifier:
according to guideline
Guideline:
EU Method A.4 (Vapour Pressure)
Version / remarks:
2009
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Type of method:
effusion method: Knudsen cell
Key result
Temp.:
20 °C
Vapour pressure:
0 Pa
Key result
Temp.:
25 °C
Vapour pressure:
0 Pa

Table 1 Results of the Effusion method

Stage No.

Temperature, °C

Δm/Δt, mg/min

Vapour pressure, Pa

1

85.0

4.5753 x 10-5

9.5674 x 10-3

2

90.0

6.8718 x 10-5

1.4470 x 10-2

3

95.0

8.8859 x 10-5

1.8839 x 10-2

4

100.0

1.3171 x 10-4

2.8113 x 10-2

5

105.0

2.1041 x 10-4

4.5211 x 10-2

6

 110.0

3.8212x10 -4

 8.2646x10 -2

7

115.0

6.9228 x 10-4

1.5070 x 10-1

8

120.0

1.4843 x 10-3

3.2519 x 10-1

 

Table 2 Regression data of the vapour pressure curve - Regression output

Intercept

Slope

R. Squared

14.6010

-5989.7893

0.9683
Conclusions:
Vapour pressure of the test item was determined using Vapor Pressure Analyzer (Knudsen Effusion Method) according to OECD TG 104. Vapour pressure of the test item was determined to be 1.474 x 10-6 Pa at 20 °C and 3.244 x 10-6 Pa at 25 °C.
Executive summary:

Vapour pressure of the test item was determined using Vapor Pressure Analyzer (Knudsen Effusion Method) according to OECD TG 104. The method stages were programmed for various temperatures with a time of 90 minutes per stage. A total of 9 stages were prepared for the entire measurement. The vapour pressure was measured in the temperature range of 80 to 120 °C. For the evaluation the vapour pressure values in the range of 85 to 120 °C were used. Vapour pressure of the test item was determined to be 1.474 x 10-6 Pa at 20 °C and 3.244 x 10-6 Pa at 25 °C.

Description of key information

The vapour pressure was determined to be 3.244E-6 Pa at 25 °C.

Key value for chemical safety assessment

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

Additional information

Vapour pressure of the test item was determined using Vapor Pressure Analyzer (Knudsen Effusion Method) according to OECD TG 104. The method stages were programmed for various temperatures with a time of 90 minutes per stage. A total of 9 stages were prepared for the entire measurement. The vapour pressure was measured in the temperature range of 80 to 120 °C. For the evaluation the vapour pressure values in the range of 85 to 120 °C were used. Vapour pressure of the test item was determined to be 1.474 x 10-6 Pa at 20 °C and 3.244 x 10-6 Pa at 25 °C.