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Physical & Chemical properties

Melting point / freezing point

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Endpoint:
melting point/freezing point
Type of information:
experimental study
Adequacy of study:
key study
Study period:
January 2012
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
EU Method A.1 (Melting / Freezing Temperature)
Principles of method if other than guideline:
Differential scanning calorimetry or DSC is a thermoanalytical technique in which the difference in the amount of heat required to increase the temperature of a sample and reference is measured as a function of temperature. Both the sample and reference are maintained at nearly the same temperature throughout the experiment.
GLP compliance:
not specified
Type of method:
differential scanning calorimetry
Specific details on test material used for the study:
- Name of test material (as cited in study report): N,N-Dimethylurea
- Physical state: sollid
- Lot/batch No.: 121110
Key result
Melting / freezing pt.:
182 °C
Decomposition:
no
Conclusions:
The melting temperature of 1,1 -Dimethylurea was measured by Differential-Scanning-Calorimetry. The test was conducted according to EC 440/2008 A.1. The substance showed a melting temperature of 182 °C.
Executive summary:

The melting temperature of 1,1 -Dimethylurea was measured by Differential-Scanning-Calorimetry. The test was conducted according to EC 440/2008 A.1. The substance showed a melting temperature of 182 °C.

Endpoint:
melting point/freezing point
Type of information:
experimental study
Adequacy of study:
supporting study
Study period:
September 2013
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
OECD Guideline 102 (Melting point / Melting Range)
GLP compliance:
not specified
Type of method:
capillary method
Specific details on test material used for the study:
- Name of test material (as cited in study report): 1,1-Dimethylurea
- Physical state: solid
- Analytical purity: 99.9 %
- Lot/batch No.: 301601
- Storage condition of test material: dry, at room temperature
Melting / freezing pt.:
181.4 - 183.2 °C
Conclusions:
Melting range of 1,1-Dimethylurea: 181.4 -183.2 °C
Executive summary:

The melting range of 1,1 -Dimethylurea was determined according to “Capillary tube in a metal block” inOECD 102 - “Melting Point /”. A capillary tube filled with the sample, was placed in a heated metal block. The temperature rise was adjusted at a suitable pre-selected linear rate. A beam of light was directed through the sample to a photocell. On melting of the sample, the intensity of the light reaching the photocell increases and a stop signal was sent to the digital indicator reading out the temperature of the heating chamber.

The block was heated in a rate of 5 °C/min.The melting range was determined twice, and a new capillary tube filled with the sample was used each time. Based on the results of this test the melting range of 1,1 -Dimethylurea was 181.4 - 183.2 °C.

 

Description of key information

Two melting point of 1,1 -Dimethylurea was determined in two independent tests:

1) The melting range of 1,1 -Dimethylurea was determined according to “Capillary tube in a metal block” inOECD 102 - “Melting Point /”. The melting range was determined twice, and a new capillary tube filled with the sample was used each time. Based on the results of this test the melting range of 1,1 -Dimethylurea was 181.4 - 183.2 °C.

2) The melting temperature of 1,1 -Dimethylurea was measured by Differential-Scanning-Calorimetry. The test was conducted according to EC 440/2008 A.1. The substance showed a melting temperature of 182 °C.

According to this results the melting point of 1,1 -Dimethylurea was defined to be 182 °C.

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:
182 °C

Additional information