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Physical & Chemical properties

Vapour pressure

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Administrative data

Link to relevant study record(s)

Reference
Endpoint:
vapour pressure
Type of information:
experimental study
Adequacy of study:
key study
Study period:
1987-10-30
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
guideline study without detailed documentation
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:
dynamic method
Key result
Test no.:
#1
Temp.:
20 °C
Vapour pressure:
2.8 Pa
Test no.:
#2
Temp.:
25 °C
Vapour pressure:
6.43 Pa
Test no.:
#3
Temp.:
50 °C
Vapour pressure:
12.1 Pa

Vapour pressure determination

 

data point 1: 92.3 hPa at 451.7 K (178.55 °C)

data point 2: 366.9 hPa at 501.3 K (228.15 °C)

 

From the data points the following equation was derived : lnP = -6718.26 x 1/T + 19.3416 and the vapour pressure at 20, 25 and 50 °C was calculated accordingly.

 

Calculated vapour pressure: 

2.8 Pa at 20 °C

6.43 Pa at 20 °C

12.1 Pa at 50 °C

 

 

Conclusions:
The vapour pressure was calculated to be 2.8 Pa at 20 °C, 6.43 Pa at 25 °C and 12.1 Pa at 50 °C respectively.
Executive summary:

A study was conducted according to OECD TG 104, Regulation (EC) No 440/2008 method A.4 to determine the vapour pressure of the test item. The vapour pressure of the test item was determined at two different temperatures (178.55 and 228.15 °C) using the dynamic method. The vapour pressure was calculated using the linear regression equation of the lnP versus 1/T function. The vapour pressure was calculated to be 2.8 Pa at 20 °C, 6.43 Pa at 25 °C and 12.1 Pa at 50 °C respectively.

Description of key information

The vapour pressure was calculated to be 2.8 Pa at 20 °C, 6.43 Pa at 25 °C and 12.1 Pa at 50 °C respectively.

Key value for chemical safety assessment

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

Additional information

A study was conducted according to OECD TG 104, Regulation (EC) No 440/2008 method A.4 to determine the vapour pressure of the test item. The vapour pressure of the test item was determined at two different temperatures (178.55 and 228.15 °C) using the dynamic method. The vapour pressure was calculated using the linear regression equation of the lnP versus 1/T function. The vapour pressure was calculated to be 2.8 Pa at 20 °C, 6.43 Pa at 25 °C and 12.1 Pa at 50 °C respectively.