{[(2,4 and 2,5 and 2,6)-dimethylphenyl and 2-ethylphenyl]amino}{[(2,4 and 2,5 and 2,6)-dimethylphenyl and 2-ethylphenyl]amino}methaniminium 3-[(4-anilinophenyl)diazenyl]benzenesulfonate

Melting point / freezing point

Link to relevant study record(s)

Reference

Reference 1

Endpoint:

melting point/freezing point

Type of information:

experimental study

Adequacy of study:

weight of evidence

Study period:

2014

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

study well documented, meets generally accepted scientific principles, acceptable for assessment

Qualifier:

equivalent or similar to guideline

Guideline:

other: SAV.421: Messungen im Differentiakalorimeter Mettler Toledo (R) System und TAI 2910/2920

GLP compliance:

no

Type of method:

differential scanning calorimetry

Specific details on test material used for the study:

- Lot/batch No.: 407940

Key result

Melting / freezing pt.:

ca. 66 °C

Decomposition:

yes

Decomp. temp.:

> 188 °C

Results (scan with 4°C/min)

Sample	Run	Thermal Signal Range [°C], Peak-Temperature [°C]	Energy [kJ/kg]
919210.14.0472.02 LIMS Nr : 23215	N° 1	Endo : 55 -77, 66 Exo : 199-263, 240	-12 204
919210.14.0472.02 LIMS Nr : 23215	N° 2	Endo : 55 -75, 66 Exo : 190 -281, 258	-12 210

Conclusions:

The test item shows a melting point at 66°C and starts decompositing at 188-190°C.

Executive summary:

A double determination of the thermal stability of the test item by DSC (Differential Scanning Calorimetry) was performed with a DSC 820e Mettler, with closed crucibles.

At the end of the measurement, the crucibles were tight and no losses was registered.

The results show an endothermic reaction between 55°C to 75-77°C, with a peak of -12 kJ/kg at 66°C. Then, an exothermic phase appears between ca. 188 -190°C, with a peak of 204-210 kJ/kg at 258°C.

It seems that the Sepisol Fast Yellow MG-F has a melting point at around 66°C, and starts decomposing at ca. 188 -190°C.

Reference 2

Endpoint:

melting point/freezing point

Type of information:

experimental study

Adequacy of study:

weight of evidence

Study period:

2014-05-21

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

study well documented, meets generally accepted scientific principles, acceptable for assessment

Qualifier:

no guideline followed

Principles of method if other than guideline:

Determination of the melting point by the thermoanalytical technique DSC

GLP compliance:

no

Type of method:

differential scanning calorimetry

Specific details on test material used for the study:

- Lot/batch No.: 407940

Key result

Melting / freezing pt.:

ca. 70 °C

Decomposition:

yes

Decomp. temp.:

ca. 230 °C

Conclusions:

The test item has a melting point according the DSC of 70°C.

Executive summary:

A determination of the thermal stability of the test item by DSC (Differential Scanning Calorimetry) was performed with a DSC Mettler TOLEDO DSC 1, using a perforated crucible.

The result shows an endothermic reaction between 52 and 79°C, with a peak of -8.79 kJ/kg at 70°C.

Then an exothermic phase starts at 230°C, consistent with the beginning of the decomposition of the test item.

It seems that the Sepisol Fast Yellow MG-F has a melting point at around 66°C, and starts decomposing at ca. 230°C.

Reference 3

Endpoint:

melting point/freezing point

Type of information:

experimental study

Adequacy of study:

weight of evidence

Study period:

2014-02-13

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

study well documented, meets generally accepted scientific principles, acceptable for assessment

Qualifier:

equivalent or similar to guideline

Guideline:

OECD Guideline 102 (Melting point / Melting Range)

Version / remarks:

similar to Kofler hot bar

Deviations:

yes

Remarks:

: hot bar PROLABO, temperature is homogenous on the hot bar

Principles of method if other than guideline:

Technic similar to the Kofler Hot bar.
Apparatus PROLABO: temperature is homegenous at every point of the hot bar

GLP compliance:

no

Type of method:

hot stages

Remarks:

similar to Kofler hot bar

Specific details on test material used for the study:

- batch: 407940

Key result

Decomposition:

yes

Decomp. temp.:

ca. 230 °C

Remarks on result:

other: The test item decompose before melting

Calibration of the hot bar Prolabo: A dividing line is observed and a fluid phase is appearing. There was a temperature lag between the theoretical melting and the measured one, but the order of magnitude is correct.

 

Test item: With the increase temperature, the test item became darker and stickier. At 163°C (non corrected value), the test item is liquefied.

 

Product	Readed T°C at which the product becomes sticky	Measured Testo's T°C of the « apparent melting »	Corrected T°C according to the « standard »	Remarks
Potassium thiocyanate Theoretical MP = 173 °C	174°C	176°C	Around 170°C the correction is estimated at -3°C
Ammonium dihydrogen phosphate Theoretical MP= 190 °C	At 194°C, crystals becomes colorless	200°C	Around 200°C the correction is estimated at -10°C	Melting point difficult to measured
Test Item Lot 316576	106°C (became darker)	138°C (liquid appearance)	Around 137°C (minus 1°C)	230°C : liquid darkens 270°C : smoke + carbonization 300°C : test stopped

Conclusions:

Under normal conditions of pressure, Sepisol Fast Yellow MG-F has no melting point.

Executive summary:

Under normal conditions of pressure, Sepisol Fast Yellow MG-F seems to have a softening point at 130°c but no melting point. The test material starts to decompose around 230°C becomes darker and at 280°C the test item is carbonized with smoke. The assay was stopped after reaching 300°C with the hot bar.

Description of key information

3 tests were performed to determine the melting of the test item:

- one hot bar test

- two DSC with open and close crucible

The substance has no melting point and starts decomposing at temperature > 200°C.

Additional information

3 tests were performed to determine the melting of the test item:

- one hot bar test

- two DSC with open and close crucible

Method used	Melting point temperature	Decomposition temperature
Hot bar method	no melting point (softening point at 130°C)	Starts at 230°C
DSC n°1 with close crucible	66°C	Starts at 188 -190°C
DSC n°2 with open crucible	70°C	Starts at 230°C

The 2 DSC, which give a close result, have both been performed with a Mettler-Toledo apparatus.

An endothermic peak in a DSC heating curve, performed with a Mettler Toledo apparatus is a melting peak if:

- the sample weight does not decrease significantly over the course of the peak, and

- the sample appears to have visibly melted after the measurement, and

- the surface area of the peak is between about 120 Jg-1 to 170 Jg-1 for non-polyleric organic substances, and

- the half-width of the peak is significantly less than 10 K (i.e. 10°C).

The surface area of the peaks is very low (-12 and -8.79 kJ/kg), which is << of the 120 kJ/kg cut off value.

No data is provided concerning the half-width of the peaks.

Therefore, the endothermic peak observed at 66 -70°C does not fulfill all the criteria of a melting peak.

Conclusion: The substance has no melting point and starts decomposing at temperature > 200°C.