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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:
2012-01-30 to 2012-01-31
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to
Guideline:
EU Method A.4 (Vapour Pressure)
Deviations:
no
GLP compliance:
yes (incl. certificate)
Type of method:
static method
Key result
Temp.:
20 °C
Vapour pressure:
1.41 mBar
Remarks on result:
other: The result is the mean of 2 runs.

Two initial runs with results of 1.08 mbar (run 1) and 1.31 mbar (run 2) were repeated as a leak in the glassware apparatus was found after completing run 2. Therefore runs 3 and 4 were carried out after leak testing.

Based on the vapour pressures measured, a vapour pressure curve was constructed (lnP vs 1/T; p in mbar and T in Kelvin). The temperature range was 29.4 °C - 70.6 °C and 30.3 °C - 72.5 °C for run 3 and run 4, respectively.

The vapour pressure at 20 °C was extrapolated from the vapour pressure curve to be 1.48 mbar (run 3) and 1.34 mbar (run 4).

Conclusions:
The vapour pressure of the substance was extrapolated from the vapour pressure curve to be 1.41 mbar (141 Pa) at 20 °C.
Executive summary:

The vapour pressure of the test item was determined according to EU Method A.4. by applying the static method. The vapour pressure of the substance was extrapolated from the vapour pressure curve to be 1.41 mbar (141 Pa) at 20 °C.

Description of key information

The vapour pressure of NMMO was determined in a GLP study according to EU method A.4 to be 141 Pa at 20°C, following the static method (Younis, 2012).

Key value for chemical safety assessment

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

Additional information