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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:
20.10.2005-21.02.2006
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
Deviations:
no
Qualifier:
according to guideline
Guideline:
EU Method A.4 (Vapour Pressure)
Deviations:
no
GLP compliance:
no
Type of method:
effusion method: Knudsen cell
Key result
Temp.:
20 °C
Vapour pressure:
0.002 Pa
Key result
Temp.:
25 °C
Vapour pressure:
0.005 hPa
Key result
Temp.:
50 °C
Vapour pressure:
0.35 hPa

Individual results

The vapour pressure was measured in the temperature range of 24 °C to 59 °C. The measured vapour pressures at the corresponding temperatures are listed in Table 1.

Table: Measured vapour pressures and corresponding temperatures

Temperature /°C

Vapour pressure / hPa

23.8

3.4E-5

24.6

5.7E-5

29.0

1.1E-4

31.8

1.9E-4.

33.7

2.5E-4

40.0

7.0E-4

44.0

1.3E-3

48.8

3.2E-3

52.4

5.2E-3

57.0

9.0E-3

Table 2: Calculated vapour pressure at 20, 25 and 50°C.

T (°C) p (Pa)
20 2.1E-3
25 5.3E-3
50 3.5E-1
Conclusions:
The vapour pressure of the test item was determined to be 2.1E-3 Pa (20 °C), 5.3E-3 Pa (25 °C) and 3.5E-1 Pa (50 °C).
Executive summary:

A study was performed according to OECD TG 104 and Commission Regulation (EC) No. 440/2008, method A.4 in order to determine the vapour pressure of the test item by using the effusion method. The vapour pressure was measured by determining the boiling point of the test item at various temperatures between about 24 and 59°C. The vapour pressures of the test item at 20, 25 and 50 °C determined to be: .1E-3 Pa (20 °C), 5.3E-3Pa (25 °C) and 3.5E-1 Pa (50 °C).

Description of key information

Key value for chemical safety assessment

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

Additional information

A study was performed according to OECD TG 104 and Commission Regulation (EC) No. 440/2008, method A.4 in order to determine the vapour pressure of the test item by using the effusion method. The vapour pressure was measured by determining the boiling point of the test item at various temperatures between about 24 and 59°C. The vapour pressures of the test item at 20, 25 and 50 °C determined to be: .1E-3 Pa (20 °C), 5.3E-3Pa (25 °C) and 3.5E-1 Pa (50 °C). (reference 4.6-1).

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