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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:
Experimental dates: October 17, 2017 to January 11, 2018
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Remarks:
The study was conducted according to an internationally recognized method, and under GLP. No deviation was reported. The test substance is adequately characterised. Therefore full validation applies.
Qualifier:
according to
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
Version / remarks:
2006
Deviations:
no
Qualifier:
according to
Guideline:
EU Method A.4 (Vapour Pressure)
Version / remarks:
Regulation (EC) No. 440/2008, as modified by Reg.(EC) No 761/2009,
Deviations:
no
GLP compliance:
yes (incl. certificate)
Remarks:
inspected on 20 & 21 June 2017 / signed on 04 September 2017
Type of method:
effusion method: Knudsen cell
Specific details on test material used for the study:
The test item was tested as received.
Key result
Temp.:
20 °C
Vapour pressure:
0.041 Pa
Temp.:
25 °C
Vapour pressure:
0.09 Pa

The corresponding measured vapour pressures are listed in the table below:

 Temperature (°C)  Vapour Pressure (hPa)
 10  7.1 E-5
 15  n.e.
 20  n.e.
 25  1.0 E-3
 30 2.0 E-3 
 35 3.7 E-3 
 40 6.6 E-3 
 30 2.3 E-3 

n.e./ not evaluable due to technical malfunction

The values for 20 and 25°C are calculated by interpolation, using the Antoine equation:

logVP (hPa) = 16.71075 - 5890.87 / (273.15 + T[°C])

(Using a value of 273.15 for constant C results in a linear dependency of log(VP) of the inverse temperature 1/T (in K). This is verified only for a limited temperature range.)

After the measurement a mass loss of approx. 39 % (w/w) was determined.

Conclusions:
Low volatility (based on volatility bands criteria for occupational exposure (Chesar / ECETOC TRA), << 500 Pa).
Executive summary:

The vapour pressure of the test substance was measured under GLP according to OECD 104 / EU A4 guideline, effusion (Knudsen cell) method.

Eight measurements were recorded between 10 and 40°C.

The vapour pressure at 20°C was interpolated from the regression with the Antoine equation at 0.041 Pa.

Description of key information

Low volatility.

Key value for chemical safety assessment

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

Additional information

A fully reliable experimental study, conducted according to a recognized OECD/EC method and under GLP, is available. It is considered as a key study, and the result is retained as key data.