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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

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.