Registration Dossier
Registration Dossier
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EC number: 209-957-0 | CAS number: 598-94-7
Melting point / freezing point
Administrative data
Link to relevant study record(s)
- 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.
Referenceopen allclose all
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
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