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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:
16 to 17 May 2013
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
according to guideline
OECD Guideline 104 (Vapour Pressure Curve)
according to guideline
EU Method A.4 (Vapour Pressure)
according to guideline
EPA OPPTS 830.7950 (Vapor Pressure)
Principles of method if other than guideline:
Not applicable
GLP compliance:
yes (incl. QA statement)
Type of method:
gas saturation method
Key result
20 °C
Vapour pressure:
2.5 Pa

Headspace vapour concentrations of test item as found after an equilibration time of 3 h, 5 h and 7 h are exposed in Table 1. The value obtained after an equilibration time of 3 h was not used for the calculation of the vapour pressure, as it can be deduced from the results that headspace saturation was not yet reached.


Table 4.6/1: Headspace vapour concentrations of test item

Equilibration time (h)

Headspace concentration (g/m3)









* not used for the calculation of the vapour pressure

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

The vapour pressure of the test material was determined according to the OECD guideline No. 104
(headspace method, similar to the gas saturation method), and under GLP.

After equilibration, the concentration in the vapour phase was measured in triplicate.
The vapour pressure at 20°C was calculated from the last two average headspace concentration (at equilibrium) using the vapour pressure equation.

The Vapour pressure of the test item is 2.5 Pa at 20°C.

Description of key information

Experimental vapour pressure = 2.5 Pa at 20°C. (OECD 104, GLP)

Low volatility.

Key value for chemical safety assessment

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

Additional information

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