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Physical & Chemical properties

Vapour pressure

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vapour pressure
Type of information:
experimental study
Adequacy of study:
key study
Study period:
No data
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
guideline study with acceptable restrictions
The study was conducted according to OECD/EC guideline. The substance is adequately characterised with its purity. However validation applies with restrictions, due to technical inaccuracy (distant extrapolation).
according to guideline
OECD Guideline 104 (Vapour Pressure Curve)
according to guideline
EU Method A.4 (Vapour Pressure)
Principles of method if other than guideline:
Not applicable
GLP compliance:
Type of method:
dynamic method
Key result
25 °C
Vapour pressure:
0.343 hPa
Remarks on result:
other: extrapolated value

 Temperature (°C)  Pressure (hPa)
 106.8 30.3 
 114.7 41.6
 121.3 54.4 
 126.6 66.6 
 132.6 83.7 
 138.4 103.0 
 142.6 118.1 
 148.8 141.7 
 155.4 183.3 

An extrapolation was made using a non-linear regression with the measuring points according to the permutation matrix of Fremann-Carrol (rap FRF/D-107) and by Antoine equation to obtain the vapor pressure at 25 °C. The boiling temperature was verified by the Siwoloboff method.

After the regression the following parameters were:


P(T) = 10{ A - [B/(t+C)] }(mmHg); P(T) = (1013/760)*10{ A - [B/(t+C)] }(hPa)


A = 7.7681; B = 2251.284; C = 244.363; T =Temperature, °C Boiling Temperature = 216.3°C (extrapolated)
(extrapolated) Low volatility.
Executive summary:

The vapour pressure of the test substance was measured according to OECD 104/EU A4 guideline, dynamic method. The result at 25°C was extrapolated from a series of measurements between 30 and 180 hPa, corresponding to 107 to 155°C.

The vapour pressure was extrapolated to be 0.343 hPa (34.3 Pa) at 25 °C.

Description of key information

(extrapolated) Low volatility. 

Key value for chemical safety assessment

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

Additional information

A reliable experimental study, conducted according to a recognized OECD/EU method, is available. Despite restrictions for accuracy, due to distant extrapolation, it is considered as a key study. The result is retained as key data.