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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:
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)
Deviations:
no
Qualifier:
according to guideline
Guideline:
other: US EPA OCSPP 830.7950
Version / remarks:
1996
Deviations:
no
GLP compliance:
no
Type of method:
effusion method: vapour pressure balance
Key result
Temp.:
20 °C
Vapour pressure:
0 Pa
Key result
Temp.:
25 °C
Vapour pressure:
0.001 Pa
Key result
Temp.:
50 °C
Vapour pressure:
0.004 Pa
Key result
Transition / decomposition:
no

Preliminary test: A endothermic effect was observed at 50 -70°C, associated to melting.

Main test:

The results of the measurements are:

No.  Temperature (°C ) Vapour pressure (Pa)
1 28 1.62 E-04
2 31 2.17 E-04
3 34 3.11 E-04
4 37 3.83 E-04
5 56 2.94 E-03
6 62 1.44 E-02
7 68 4.14 E-02
8 73 8.92 E-02
9 78 1.58 E-01
10 83 2.55 E-01
11 73 1.18 E-01
12 78 2.07 E-01
13 83 3.41 E-01
14 88 5.14 E-01
15 92 8.24 E-01

After data point 10 at 83 °C the vapour pressure balance was cooled to 73 °C and degassed for 30 minutes. The vapour pressure was subsequently measured again at 73, 78 and 83 °C and further at 88 and 92 °C.

Antoine constants:

A = 18.1673

B = -6665.68

C = 273.15

Conclusions:
The vapour pressure of the test item was calculated to be 2.7E-05 Pa at 20°C, 6.5E-04 Pa at 25°C and 3.5E-03 Pa at 50°C.

Executive summary:

In the current study the vapour pressure of the test item is determined according to Regulation EC No. 440/2008 Method A.4. Vapour Pressure, OECD Test Guideline No. 104 (2006), and OCSPP Test Guideline 830.7950 (1996).

The vapour pressure balance method was used. Taking into account the geometry of the vapour pressure balance, physical data of the test item and the evaporation rate Δm/Δt the vapour pressure is calculated.

The vapour pressure of the test item 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 item was calculated to be 2.7E-05 Pa at 20°C, 6.5E-04 Pa at 25°C and 3.5E-03 Pa at 50°C.

Description of key information

The vapour pressure of the test item was calculated to be 2.7E-05 Pa at 20°C, 6. E-04 Pa at 25°C and 3.5Ee-03 Pa at 50°C.

Key value for chemical safety assessment

Vapour pressure:
0 Pa
at the temperature of:
20 °C

Additional information

For this endpoint, one study is available. In this study the vapour pressure of the test item was determined according to the Regulation EC No. 440/2008 Method A.4. Vapour Pressure, OECD Test Guideline No. 104 (2006), and OCSPP Test Guideline 830.7950 (1996). The vapour pressure was determined with an effusion method, more specifically the vapour pressure balance method.

The vapour pressure of the test item was calculated to be 2.7E-05 Pa at 20°C, 6.5E-04 Pa at 25°C and 3.5E-03 Pa at 50°C.

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