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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:
From September 22, 2004 to September 30, 2004
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
accepted calculation method
Qualifier:
according to guideline
Guideline:
EU Method A.4 (Vapour Pressure)
Deviations:
no
Qualifier:
according to guideline
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Type of method:
effusion method: vapour pressure balance
Temp.:
20 °C
Vapour pressure:
< 0 hPa
Remarks on result:
other: Estimated vapour pressure
Temp.:
25 °C
Vapour pressure:
< 0 hPa
Remarks on result:
other: Estimated vapour pressure
Temp.:
50 °C
Vapour pressure:
0 - < 0 hPa
Remarks on result:
other: Estimated vapour pressure

- The vapour pressure was measured in the temperature range of 34 to 150°C.

- No vapour pressure of the test substance was observed in the entire range, meaning that the vapour pressure in the whole range was below the lower detection limit of 10E-5 hPa. The vapour pressure was measured at the following temperatures: 34.0, 46.0, 54.4, 66.3, 78.2, 83.7, 93.4, 102.6, 112.6, 120.2, 130.8, 139.9, 150.0 and 150.1°C. For every temperature, the vapour pressure of the test substance was <10E-5 hPa.

- Vapour pressure at 20, 25 and 50°C was calculated using the Antoine equation. Calculated vapour pressure were as follows:

 

Temperature (°C)

Vapour pressure (hPa)

Vapour pressure (Pa)

20

5.72 x 10 -11

5.72X10-9

25

1.10x10-10

1.10 x 10-8

50

2.19X10-9

2.19X10-7

 

This was a conservative estimation of the vapour pressure of the test substance for the listed temperatures.

Since the true vapour pressure was most likely to be even much lower than this value derived from the detection limit, it may safely be assumed that the vapour pressure at the above listed temperatures was far below 10E-7 hPa (10E-5 Pa).

Conclusions:
Under the conditions of the test, the calculated vapour pressure values were 5.72 x 10E-11, 1.10x10E-10 and 2.19 X 10E-9 hPa at 20, 25 and 50°C, respectively.
Executive summary:

A study was conducted to determine the vapour pressure of the test substance according to OECD Guideline 104 and EU Method A.4, in compliance with GLP.

The determination of vapor pressure was carried out according to the effusion method (vapour pressure balance). The vapour pressure was measured at the following temperatures: 34.0, 46.0, 54.4, 66.3, 78.2, 83.7, 93.4, 102.6, 112.6, 120.2, 130.8, 139.9, 150.0 and 150.1°C. For every temperature the vapour pressure of the test substance was <10E-5 hPa.

Under the conditions of the test, the calculated vapour pressure values for the test substance were 5.72x10E-11, 1.10x10E-10 and 2.19X10E-9 hPa at 20, 25 and 50°C, respectively.

Description of key information

The calculated vapour pressure values for the test substance were 5.72 x 10E-11, 1.10x10E-10 and 2.19 X 10E-9 hPa

at 20, 25 and 50°C, respectively (Franke, 2004).

Key value for chemical safety assessment

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

Additional information