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Administrative data

melting point/freezing point
Type of information:
experimental study
Adequacy of study:
key study
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study

Data source

Reference Type:
study report
Report date:

Materials and methods

Test guideline
according to guideline
OECD Guideline 102 (Melting point / Melting Range)
Version / remarks:
GLP compliance:
yes (incl. QA statement)
Type of method:
differential scanning calorimetry

Test material

Constituent 1
Reference substance name:
Acid Navy RN-2682
Acid Navy RN-2682
Test material form:

Results and discussion

Melting / freezing point
Melting / freezing pt.:
> 400 °C

Any other information on results incl. tables

Preliminary tests

One broad endothermic heat effect was observed, starting at 60.8 °C, followed by an exothermic reaction starting at about 260 °C. After the experiment, the sample had lost about 17% of its mass and the sample was black and swelled.

Main tests

Melting Point / Melting Range

In order to define the nature of the endothermic heat effect more precisely, a DSC main test was recorded between 25 °C and 210 °C with a heating rate of 10 °C/min. After the measurement the sample was still a black powder and was not molten, loosing about 7.6% of its mass.

In conclusion, Acid Navy RN-2682 does not melt under the conditions of the test.

Boiling Point / Boiling Range

A DSC main test run was recorded in the temperature range from 25 °C and 400 °C (heating rate 10 °C/min) which confirmed the results obtained during the preliminary test. The exothermic reaction starting at about 260 °C showed that Acid Navy RN-2682 decomposed before boiling occurred. After the experiment, a black residue remained and the sample lost about 21% of its mass.

The atmospheric pressure during the measurements was 99.2 kPa.

Applicant's summary and conclusion

The substance does not melt as shown in a DSC assay up to 400 °C. The substance decomposes starting at about 260 °C before boiling occurs.