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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:
12 May - 25 May 2015
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
Version / remarks:
adopted in 2006
Qualifier:
according to
Guideline:
EU Method A.4 (Vapour Pressure)
Version / remarks:
adopted in 2008
GLP compliance:
yes (incl. certificate)
Remarks:
Ministerium für Arbeit, Integration und Soziales des Landes Nordrhein-Westfalen, Düsseldorf, Germany
Type of method:
effusion method: vapour pressure balance
Specific details on test material used for the study:
Storage conditions: at room temperature, tightly closed, dry
Temp.:
20 °C
Vapour pressure:
0 hPa

Results

The sample was degassed under vacuum. The measurements started at the initial temperature and the temperature was increased stepwise.

Temperature

[°C]

Vapour pressure1)

[Pa]

30

0.0213

40

0.0674

50

0.4298

60

1.3477

70

1.0439*

80

2.1448*

90

0.6157*

75

0.7573*

55

0.1073*

1)Mean value of triplicate measurements

* not used for test evaluation; partly strong fluctuations from the base line

Calculated pressure: 20 °C, 3.8E-03 Pa

The vapour pressure of the test item at 20 °C was calculated by mathematical extrapolation using the Antoine equation. It was determined to 3.8 x 10-3Pa3.8E-05 hPa (at 20 °C).

Antoine equation:

A

B

C

ln p [kPa] = A – B / (T [K] – C)

30.7984

10952.96

40.00

log p [hPa] = A – B / (T [°C] + C)

14.3756

4756.81

233.15

 

After the completion of the measurements, crystalline residues of the test item were found under the furnace lid. Enamelled parts were seen at the bottom of the apparatus. It was concluded that the test item melted during the measurement.


The vapour pressure of the test item was determined according to OECD guideline no. 104 [adopted on 23 March 2006] and EU test method A.4 [Council Regulation (EC) No 440/2008] with the vapour pressure balance. It was determined to be equal to 3.8E-05 hPa.

Description of key information

3.8E-05 hPa at 20 °C (OECD 104, vapour pressure balance)

Key value for chemical safety assessment

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

Additional information