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Diss Factsheets

Administrative data

melting point/freezing point
Type of information:
experimental study
Adequacy of study:
key study
Study period:
13 December 2011-3 April 2012
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: According to OECD Guideline 102

Data source

Reference Type:
study report
Report date:

Materials and methods

Test guideline
according to guideline
OECD Guideline 102 (Melting point / Melting Range)
Type of method:
thermal analysis
Differential scanning calorimetry.

Test material

Constituent 1
Chemical structure
Reference substance name:
Amines, (C16-18 and C18-unsatd. alkyl)dimethyl
EC Number:
EC Name:
Amines, (C16-18 and C18-unsatd. alkyl)dimethyl
Cas Number:
Molecular formula:
R-N(Me)2, whereas R= C16-18-alkyl (even numbered, unbranched, saturated and C18 unsaturated)
N,N-dimethyl-C16-18-(even numbered, C18 unsaturated)-alkyl-1-amines

Results and discussion

Melting / freezing point
Melting / freezing pt.:
-10 °C
Atm. press.:
1 013 hPa

Any other information on results incl. tables

The sample shows a broad endothermic melting peak in the -20 to +10 °C region. There is also an endothermic peak in the -55 to -40 °C region.

Individual values:

Measurement       Onset       Peak

#1                     -9.7 °C     4.7 °C

#2                     -9.7 °C     4.4 °C

The mean onset (rounded to -10 °C) is selected as giving the best value of the melting point. The difference between the lower onset value and the higher peak value is used to estimate the uncertainty.

The test substance was thermostatted at -20°C for 15 minutes. Under these conditions it is a white solid with crystalline appearance. This confirms that the endothermic peak in the -55 to -40 °C region does not correspond to a macroscopic melting process. The physical processes responsible for the low temperature peak have not been determined.

Applicant's summary and conclusion

The melting point of the test substance is -10 ± 7 °C.
Executive summary:

The melting point of the test substance was determined according to the OECD Guideline 102 using differential scanning calorimetry. At 1013 hPa, the melting point is -10 +/- 7 °C.