Reaction mass of Cuprate(4-), [μ-[[3,3'-methylenebis[6-[[5-[(2,4-disulfophenyl)azo]-2,4-dihydroxyphenyl]azo]benzoato]](8-)]]di-, sodium and copper (2+) pentasodium 2-[2-{2-amino-5-[2-(2,4-disulfophenyl)diazen-1-yl]-4-hydroxyphenyl}diazen-1-yl]-5-({3-carboxy-4-[2-{5-[2-(2,4-disulfophenyl)diazen-1-yl]-4-hydroxy-2-oxidophenyl}diazen-1-yl]phenyl}methyl)benzoate and sodium chloride

Melting point / freezing point

Administrative data

Endpoint:

melting point/freezing point

Remarks:

Melting Point / OECD 102 / EU A.1.

Type of information:

experimental study

Adequacy of study:

key study

Study period:

July 2018

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2018

Report date:

2018

Materials and methods

Test guideline

Test guideline 1

Qualifier:

according to guideline

Guideline:

OECD Guideline 102 (Melting point / Melting Range)

Test guideline 2

Qualifier:

according to guideline

Guideline:

EU Method A.1 (Melting / Freezing Temperature)

GLP compliance:

no

Remarks:

Not required

Type of method:

other: Differential Scanning Calorimeter DSC 850 Pelkin Elmer

Remarks:

Validated Pyris software with enhanced security version 11.1.1.0492

Test material

Test material information

Constituent 1

Reference substance name:

Reaction mass of Cuprate(4-), [μ-[[3,3'-methylenebis[6-[[5-[(2,4-disulfophenyl)azo]-2,4-dihydroxyphenyl]azo]benzoato]](8-)]]di-, sodium and copper(2+) disodium 5-[(3-carboxyphenyl)methyl]-2-[2-{4-hydroxy-2-oxido-5-[2-(4-sulfophenyl)diazen-1-yl]phenyl}diazen-1-yl]benzoate” and sodium chloryde

EC Number:

948-009-7

Molecular formula:

Not applicable for a multi-constituent substance

IUPAC Name:

Reaction mass of Cuprate(4-), [μ-[[3,3'-methylenebis[6-[[5-[(2,4-disulfophenyl)azo]-2,4-dihydroxyphenyl]azo]benzoato]](8-)]]di-, sodium and copper(2+) disodium 5-[(3-carboxyphenyl)methyl]-2-[2-{4-hydroxy-2-oxido-5-[2-(4-sulfophenyl)diazen-1-yl]phenyl}diazen-1-yl]benzoate” and sodium chloryde

Test material form:

solid: particulate/powder

Details on test material:

Acid brown 161 batch no. ID151860 CAS no. 85338-16-5
Composition of the muti-constituent substance is included in the report as an extract of the analytical report.

Results and discussion

Melting / freezing point

Key result

Decomp. temp.:

>= 127.25 °C

Remarks on result:

other: melting point cannot be performed under these test circumstance as the test substance decomposes

Any other information on results incl. tables

Pre-test for melting point

Observations	Temperature in °C
Forming of ab brown condensate	115
More condensate	164
Colour getting darker (black)	Since approx. 290
Gas burner was turned off	400

Values DSC Test substance

	Temperature[°C]	Heat flow
Decomposition begin (event marker)	127.25 (Onset)	13.35[mW]

Observations

Values observations

	Mass test substance	Mass crucible (before measurement):	Mass crucible (after measurement):	Observations
First Measurement	2.31 mg	34.68 mg	34.29 mg	After the test the crucible was visually unchanged. The crucible was opened, the test substance was light brown (lighter than original).

Presentation of results

	Temperature[°C]	Heat flow
Decomposition begin (event marker)	127.25 (Onset)	13.35[mW]

Applicant's summary and conclusion

Conclusions:

The determination of the melting point of Acid Brown 161 was performed via DSC (differential scanning calorimetry).
A turbulent baseline with three endothermic events and rising of base line was detected.
Also the condensate and colour changes were observed in the pre-test.
Based on observations in the pre-test this was considered as decomposition, therefore the determination of the melting point of TCMTB pure is technically not feasible as the test item decomposes before melting.
The beginning of decomposition process was evaluated with the event marker as:
127.25 °C (400.40 K)