Urea, N,N''-(methylenedi-4,1-phenylene)bis[N',N'-dimethyl-

Melting point / freezing point

Administrative data

Endpoint:

melting point/freezing point

Type of information:

experimental study

Adequacy of study:

key study

Study period:

January 2003

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

test procedure in accordance with national standard methods with acceptable restrictions

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2011

Report date:

2011

Materials and methods

Test guideline

Qualifier:

equivalent or similar 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

Test material

Test material information

Constituent 1

Reference substance name:

-

EC Number:

423-370-9

EC Name:

-

Cas Number:

10097-09-3

Molecular formula:

C19H24N4O2

IUPAC Name:

1-[4-({4-[(dimethylcarbamoyl)amino]phenyl}methyl)phenyl]-3,3-dimethylurea

impurity 1

Reference substance name:

unknown

IUPAC Name:

unknown

impurity 2

Reference substance name:

Water

EC Number:

231-791-2

EC Name:

Water

Cas Number:

7732-18-5

Molecular formula:

H2O

IUPAC Name:

Water

Test material form:

solid: bulk

Results and discussion

Melting / freezing point

Key result

Melting / freezing pt.:

>= 216 - <= 218 °C

Atm. press.:

ca. 1 013 hPa

Decomposition:

yes

Decomp. temp.:

>= 200 °C

Sublimation:

no

Any other information on results incl. tables

The melting point of MDI-Urone was determined applying DSC. 7.4 mg test substance were put into a platen and heated up to 300°C. The onset (216°C) and the peak (218°C) of the endothermic heat fluxes were measured. The melting point is reported as the peak of the endothermic heat fluxes.

Applicant's summary and conclusion

Conclusions:

The melting point of MDI-Urone is 216-218°C.

Executive summary:

The melting point of MDI-Urone was determined applying differential scanning calorimetry. The test protocol is equivalent to the guideline EU A.01. The test substance, 7.4 mg TDI-Urone, were put into a platen at room temperature and heated up to 300°C. The onset and the peak of the endothermic heat fluxes were reported. The onset of the endothermic heat flux is 216°C and reaches a peak at 218°C. According the guideline EU A.01 the melting point is the temperature at which the final stage of melting is reached. Therefore, the melting point of TDI-Urone is 216 -218°C.