Propanenitrile, 3-[[4-[[5,6(or 6,7)-dichloro-2-benzothiazolyl]azo]phenyl]ethylamino]-

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:

September 08, 2021 - September 23, 2021

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

EU Method A.1 (Melting / Freezing Temperature)

Version / remarks:

EC No. 440/2008

Deviations:

no

Qualifier:

according to guideline

Guideline:

OECD Guideline 102 (Melting point / Melting Range)

Version / remarks:

1995

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Type of method:

differential scanning calorimetry

Remarks:

Additional measurement with the capillary method was performed in order to clarify the melting range.

Key result

Melting / freezing pt.:

>= 133 - <= 170 °C

Decomposition:

yes

Decomp. temp.:

>= 190 °C

Individual results:

Melting point / melting range: DSC measurement:

Two DSC measurements in aluminium crucibles with a hole showed a multistage endothermal effect in the temperature range of 90 – 200 °C with no clear melting point (onset). At 200 °C an exothermal effect started, indicating the decomposition of the test item.

The results of the DSC measurements are summarized in Table 1.

Table 1: Melting point (DSC measurements)

Ident No.	Test item / mg	Starting temperature / °C	Final test temperature / °C	Temperature range (endo-thermal) / °C	Onset (melting) / °C	Crucible	Observations after the measurement
39741	12.61	25	500	90 –190	multi-stage	Aluminium with a hole	Black residue, mass loss 49 %
39744	12.65	25	200	95 – 195	multi-stage	Aluminium with a hole	Test item was a dark green melt

An additional measurement with the capillary method was performed in order to clarify the melting range.

Melting point / melting range: capillary tube in a metal block:

A measurement with the capillary method was performed to clarify the results of the DSC measurements. The filling height of the test item was approximately 5 mm.

The results are summarized in Table 2.

Table 2: Results of the capillary method

No.	Set point / °C	Heating rate / K/min	End point / °C	Remarks
1	120	1	200	136.7 °C: test item appeared wet Approx. 160 °C: half of the test item appeared melted 169.7 °C: red melt Approx. 190 °C: test item darkened to dark red
2	120	1	200	135.5 °C: test item started to melt 159.5 °C: half of the test item appeared melted 165.3 °C: red melt Approx. 190 °C: test item darkened to dark red
3	120	1	200	133.3 °C: test item started to melt 155.3 °C: half of the test item appeared melted 163.9 °C: red melt Approx. 190 °C: test item darkened to dark red

The capillary method measurement showed that the test item melted within a wide temperature range from 133 to 170 °C.

Under consideration of the results from the DSC measurements and the capillary method it was concluded that the test item melted within a range of 133 – 170 °C. Afterwards decomposition started.

The test item had a melting range of 133 – 170 °C.

Conclusions:

The test item Disperse Red 153 had a melting range of 133 - 170 °C.
Decomposition started at approximately 190°C.

Executive summary:

The melting point of the test item was measured by DSC-measurements and by capillary tubes in a metal block.

The test item Disperse Red 153 had a melting range according to European Commission Regulation (EC) No. 440/2008, A.1. as well as OECD 102 (1995) of 133 - 170 °C.

Description of key information

The melting point of the test item was measured by DSC-measurements and by capillary tubes in a metal block.

The test item Disperse Red 153 had a melting range according to European Commission Regulation (EC) No. 440/2008, A.1. as well as OECD 102 (1995) of 133 - 170 °C.

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:

133 °C

Additional information

The test item Disperse Red 153 had a melting range of 133 - 170 °C.

Decomposition started at approximately 190°C.