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Diss Factsheets

Physical & Chemical properties

Melting point / freezing point

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melting point/freezing point
Type of information:
experimental study
Adequacy of study:
key study
Study period:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
according to guideline
EU Method A.1 (Melting / Freezing Temperature)
GLP compliance:
yes (incl. QA statement)
Type of method:
capillary method
Key result
Melting / freezing pt.:
179 - 183 °C
Atm. press.:
101.325 kPa
Remarks on result:
other: Pressure at which the measurements were taken was not reported; ambient conditions anticipated.

Full test results:

 Run number  1  2
 Mass of sample used (g)  0.004  0.004
Initial melting point (°C)   179.3  180.9
Final melting point (°C)   182.5  182.9


The melting range of NMMO was determined to be 179-183 °C at ambient conditions.
Executive summary:

The melting range of the test item was determined according to EU Method A.1. by applying the capillary method. The melting range of NMMO was determined to be 179–183 °C at ambient conditions.

Description of key information

The melting range of NMMO under ambient conditions was determined to be 179-183°C in a GLP study according to test method EC A.1, capillary method (Younis, 2012).

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:
179 °C

Additional information

For the chemical safety assessment the lower end value of the melting range (179°C) was taken as the key value.