Disodium 3-[[4-amino-9,10-dihydro-9,10-dioxo-3-[sulphonato-4-(1,1,3,3-tetramethylbutyl)phenoxy]-1-anthryl]amino]-2,4,6-trimethylbenzenesulphonate

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:

From December 18, 2017 to February 06, 2018

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:

OECD Guideline 102 (Melting point / Melting Range)

Version / remarks:

1995

Qualifier:

according to guideline

Guideline:

EU Method A.1 (Melting / Freezing Temperature)

GLP compliance:

no

Type of method:

differential scanning calorimetry

Decomposition:

yes

Decomp. temp.:

290 °C

DSC analysis

Between 250 – 270 °C a second small endothermic effect could be detected. These effects are untypical for melting of the test item. Two exothermic effects were observed in the temperature range 290 – 350 °C and 350 – 460 °C with an overall decomposition energy of -140 J/g and -80 J/g respectively.

Sample weight / mg	Onset of Effect / °C	Range of effect / °C	Energy g/J	Weight loss / mg	Atmospheric pressure / hPa
5.95	60.6	60 – 200 (endo)	103.17	2.38	1020
		250 – 270 (endo)	4.27
		290 – 350 (exo)	-63.5
		360 – 440 (exo)	-12.12
7.24	42.35	40 – 220 (endo)	298.54	2.36	1020
		250 – 270 (endo)	4.64
		290 – 310 (exo)	-47.37
		350 – 460 (exo)	-89.35

Capillary method

The test item showed no melting in the temperature range from ambient temperature to 295 °C. Above 295 °C the test item decomposes under evolution of gas and the colour of the test item changed to black.

One to this result, the item shows no melting of the test item until the decomposition starts at a temperature of 295 °C.

Conclusions:

The substance decomposes before melting (at 290 °C)

Executive summary:

The thermal behaviour of test item was assessed using the DSC analysis, according to the OECD guideline 102.

The test item does not melt up to the decomposition of approx. 290 °C at atmospheric pressure (1020 hPa) as determined by differential scanning calorimetry. To verify the results of the DSC measurement, three additional measurements with the capillary method were performed in the temperature range of 28 – 310 °C with a heating rate of 10 K/min. The test item showed no melting in the temperature range from ambient temperature to 295 °C. Above 295 °C the test item decomposes under evolution of gas and the colour of the test item changed to black.

One to this result, the item shows no melting of the test item until the decomposition starts at a temperature of 295 °C.

Conclusion

The substance decomposes before melting (at 290 °C)

Description of key information

The substance decomposes before melting (at 290 °C)

Additional information

OECD 102 - DSC and capillary methods