Disodium 3,3'-[[6-[bis(2-hydroxyethyl)amino]-1,3,5-triazine-2,4-diyl]bis[imino(3-methoxy-4,1-phenylene)azo]]bis[benzenesulphonate]

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 July 25 to November 11, 2017

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

Deviations:

no

Qualifier:

according to guideline

Guideline:

other: OECD Test Guideline 113: Thermal Stability

Version / remarks:

1981

Deviations:

no

Qualifier:

according to guideline

Guideline:

EU Method A.1 (Melting / Freezing Temperature)

Deviations:

no

Qualifier:

according to guideline

Guideline:

EPA OPPTS 830.7200 (Melting Point / Melting Range)

Version / remarks:

1998

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Type of method:

differential scanning calorimetry

Remarks:

and capillary method

Decomp. temp.:

270 - 280 °C

Decomp. temp.:

300 °C

MELTING POINT - DSC method

Starting at a temperature of 80 °C and 270 °C the test item showed two endothermic effects, which cannot be clearly assigned to a melting of the test item. An exothermic effect was detected starting at a temperature of 300 °C with an averaged energy release of -230 J/g.

Results of DSC analysis

No.	Sample weight (mg)	Onset of Effect (°C)	Range of effect (°C)	Weight loss (mg)	Atmospheric pressure (hPa)
PN13885	18.68	100	50	5.01	996.1
		270	30
		300	-180
PN13886	13.17	80	80	3.48	996.1
		280	10
		300	-280

MELTING POINT - capillary method

Starting at a temperature of approx. 288 °C the colour of the test item gets darker. At a temperature of approx. 305 °C the colour turned into black and test item started to decompose. Between 25 – 300 °C no melting of the test item could be observed. According to the observations during the tests with the capillary method, the endothermic effects in the DSC measurements with open crucibles cannot be assigned to the melting of the test item. Since the test item contains 2.3 % water, it can be assumed, that the endothermic effect is caused by the drying of the test item.

THERMAL STABILITY

The test item shows a first exothermic effect from 220 °C with an average energy release of -20 J/g. An endothermic effect is detected from 240 °C. This effect leads into an exothermic effect, starting from 260 °C with an average energy release of -350 J/g.

No.	Sample weight (mg)	Start of effect (°C)	Energy (J/g)
PN13874	7.43	220	-10
		240	20
		260	-320
PN13875	7.32	220	-20
		240	20
		260	-380

Conclusions:

The substance decomposes before melting (270 and 300 °C).

Executive summary:

The thermal behaviour of test item was assessed using the DSC analysis, according to the OECD guideline 102 and OECD guideline 113. To verify the results of the DSC measurement, three additional measurements with the capillary method were performed from room temperature to 300 °C with a heating rate of 10 K/min.

The test item has no melting point up to its decomposition as determined by differential scanning calorimetry and capillary method.

In the DSC-measurements the test item showed a first exothermic effect from 220 °C with an average energy release of -20 J/g. An endothermic effect is detected from 240 °C. This effect led into an exothermic effect, starting from 260 °C with an average energy release of -350 J/g.

Conclusion

The substance decomposes before melting (270 and 300 °C).

Description of key information

The substance decomposes before melting/boiling (at ca 270 - 300 °C).

Additional information

OECD 102 and OECD 113 - DSC analysis and capillary method