disodium 4-amino-6-((4-((4-(2,4-diaminophenyl)azo)phenylsulfamoyl)phenyl)azo)-5-hydroxy-3-((4-nitrophenyl)azo)naphthalene-2,7-disulfonate

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:

November 11, 2009-November 21, 2011

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

test procedure in accordance with generally accepted scientific standards and described in sufficient detail

Qualifier:

according to guideline

Guideline:

EU Method A.1 (Melting / Freezing Temperature)

GLP compliance:

no

Type of method:

thermal analysis

Remarks:

DSC

Melting / freezing pt.:

> 200 °C

Decomposition:

yes

Decomp. temp.:

> 200 °C

Remarks on result:

other: Thermal decomposition of the test substance connected with the lost of the mass started at the temperature 200°C.

The endothermic peak was observed between 60°C and 200°C. The two exothermic peaks probably caused by decomposition of the test substance were observed between 200°C and 360°C. After the experiment the sample non-appeared to be molten, had lost 0.87 mg (34.5%) of its mass and the residue had a black colour.

The enthalpy of the decomposition between 200°C and 360°C is 517 J/g.

Conclusions:

No endothermic peak corresponding to melting of the test substance was recorded in the tested temperature range from 30° to 600°C. Thermal decomposition of the test substance in connection with the lost of the mass started at the temperature 200°C.
The enthalpy of the decomposition between 200°C and 360°C is 517 J/g.

Executive summary:

The substance was tested for melting/freezing point by DCS thermal analysis in the range of 30° to 600°C. No endothermic peak corresponding to melting of the test substance was recorded. Thermal decomposition of the test substance in connection with the lost of the mass started at the temperature 200°C.

Description of key information

Decomposition > 200°C

Additional information

One study was performed on Acid Black 210 (Stahl, 1996) by means of Kofler hot bar method. Only the visual appearing of a dividing line between solid and liquid can be assessed by this method, irrespectively from the fact that decomposition or actual melting has happened.

Another study (Michal Bartos, 2010) on Acid Black 210 was performed by means of DSC, that showed only the onset of a thermal decomposition at 200°C. No peak corresponding to melting point was observed.