N,N''-(methylenedi-4,1-phenylene)bis[N'-(4-methylphenyl)urea]

Melting point / freezing point

Link to relevant study record(s)

Reference

Endpoint:

melting point/freezing point

Type of information:

experimental study

Adequacy of study:

key study

Study period:

29 November 1993

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

EU Method A.1 (Melting / Freezing Temperature)

Version / remarks:

1992

Deviations:

no

GLP compliance:

yes

Type of method:

differential scanning calorimetry

Key result

Melting / freezing pt.:

ca. 288 °C

Decomposition:

yes

Remarks on result:

other: Reaction/decomposition starts during melting.

First experiment:

An endothermic effect started at 265°C. This effect was probably caused by melting of the substance. The extrapolated onset of the melting peak was 287°C. The maximum of the effect was at 309°C. Above this temperature, the effect changed to exothermic which indicates reaction or decomposition of the substance. After the experiment the sample appeared to have been molten; the colour was dark brown. Mass loss of the sample 66%.

 

Second experiment:

The DSC-curve shows an endothermic effect which starts at 275°C. The extrapolated onset of the melting peak was 288°C. After the experiment the sample had a brown beige colour. Mass loss of the sample: 40%.

 

Conclusions:

The melting temperature was determined to be ca. 288°C. Reaction/decomposition starts during melting.

Executive summary:

Differential Scanning Calorimetry (DSC) experiments were performed in a GLP study according to EC A.1. The melting temperature was determined to be ca. 288°C. Reaction/decomposition starts during melting.

Description of key information

Melting point: ca. 288°C (EC A.1: DSC). Reaction/decomposition starts during melting.

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:

288 °C