Disodium 4,4'-bis[[1-[[(2,4-dimethylphenyl)amino]carbonyl]-2-oxopropyl]azo][1,1'-biphenyl]-2,2'-disulphonate

Melting point / freezing point

Administrative data

Endpoint:

melting point/freezing point

Type of information:

experimental study

Adequacy of study:

key study

Study period:

from 12 April 2016 to 13 April 2017

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2017

Report date:

2017

Materials and methods

Test guideline

Test guideline 1

Qualifier:

according to guideline

Guideline:

EU Method A.1 (Melting / Freezing Temperature)

Version / remarks:

2008

Deviations:

no

Test guideline 2

Qualifier:

according to guideline

Guideline:

OECD Guideline 102 (Melting point / Melting Range)

Version / remarks:

1995

Deviations:

no

Test guideline 3

Qualifier:

according to guideline

Guideline:

EPA OPPTS 830.7200 (Melting Point / Melting Range)

Version / remarks:

1998

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Type of method:

differential scanning calorimetry

Test material

Reference

Name:

Unnamed

Type:

Constituent

Test material form:

solid: particulate/powder

Details on test material:

- Appearance: yellow/brown powder
- Storage conditions: in refrigerator (2-8°C)

Results and discussion

Melting / freezing point

Key result

Decomposition:

yes

Decomp. temp.:

> 225 °C

Remarks on result:

other: no melting point

Any other information on results incl. tables

TGA EXPERIMENT (PRELIMINARY TEST)

From 50°C upwards the weight of the sample decreased significantly. 25% weight loss at 346°C. 56% weight loss at 550°C. After the experiment, a black residue remained in the sample container (original colour: yellow/brown). The change of the colour indicated reaction and/or decomposition of the test item.

 

DSC EXPERIMENT

DSC curve: see illustration below. A broad endothermic peak between 25°C and 225°C was observed. The effect was most likely obtained due to evaporation of impurities in the test item. The endothermic peak between 225°C and 346°C was due to reaction and/or decomposition of the test item. After the experiment, a brown residue remained in the sample container.

 

Applicant's summary and conclusion

Conclusions:

The substance has no melting temperature. Decomposition starts at > 225°C.

Executive summary:

In a GLP study according to EC A.1, OECD 102 and OPPTS 830.7200 it was concluded from a DSC experiment that reaction and/or decomposition of the test item started at temperatures above 225°C. Melting of the test item was not observed below the temperature at which reaction and/or decomposition started. The substance has no melting temperature.