Registration Dossier
Registration Dossier
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Reaction mass of 6-(2-ethyl-6-methylanilino)-5-(4-{4-[ethyl(3-sulfobenzyl) amino] phenylazo} phenylazo)-4-hydroxynaphthalene-2-sulfonic acid, sodium and/or disodium salt(s) and 6-(2-ethyl-6-methylanilino)-5-(4-{4-[ethyl(4-sulfobenzyl) amino] phenylazo} phenylazo)-4-hydroxynaphthalene-2-sulfonic acid, sodium and/or disodium salt(s)
EC number: 475-080-7 | CAS number: -
Melting point / freezing point
Administrative data
- Endpoint:
- melting point/freezing point
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
Data source
Reference
- Reference Type:
- study report
- Title:
- Unnamed
- Year:
- 2 007
- Report date:
- 2007
Materials and methods
Test guideline
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 102 (Melting point / Melting Range)
- Version / remarks:
- 1995
- GLP compliance:
- yes (incl. QA statement)
- Type of method:
- differential scanning calorimetry
Test material
- Reference substance name:
- Acid Navy RN-2682
- IUPAC Name:
- Acid Navy RN-2682
- Test material form:
- solid
Constituent 1
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
- Conclusions:
- 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.
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