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Melting point / freezing point

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Reference
Endpoint:
melting point/freezing point
Type of information:
experimental study
Adequacy of study:
key study
Study period:
2017
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
OECD Guideline 102 (Melting point / Melting Range)
Deviations:
no
Qualifier:
according to guideline
Guideline:
EU Method A.1 (Melting / Freezing Temperature)
Version / remarks:
according to OECD 102 / 103 resp. EU A.1 / A2
Deviations:
no
GLP compliance:
no
Other quality assurance:
ISO/IEC 17025 (General requirements for the competence of testing and calibration laboratories)
Type of method:
differential scanning calorimetry
Key result
Decomposition:
yes
Decomp. temp.:
>= 172.02 °C
Remarks on result:
not determinable

Values DSC test substance second determination

Temperature[°C]

Heat flow

Decomposition

172.02

47.06 mW

 

1.1     Observations

Table3.5‑a      Values observations

Mass test substance

Mass crucible (before measurement):

Mass crucible (after measurement):

Observations

First

Measurement

1.12 mg

33.79 mg

33.58 mg

After the test the crucible

was bloated

Second Measurement

 

1.05 mg

47.91 mg

45.48 mg

After the test the crucible

was bloated

 

Conclusions:
No melting or boiling point of Blendazol Orange could bedetermined via DSC (differential scanning calorimetry) under these circumstances, because of decomposition of the test substance.
Executive summary:

No melting or boiling point of Blendazol Orange could bedetermined via DSC (differential scanning calorimetry) under these circumstances, because of decomposition of the test substance.

In all runs small endothermic and exothermic were detected.

Referring to the pre-test, beginning decomposition was observed at 280 °C indicated by colour change. The bloated crucible after the DSC measurements and the remained black residue confirmed the decomposition.

Therefore beginning decomposition should be stated as:

 

172.02 °C (445.17 K)

Description of key information

No melting or boiling point of Blendazol Red could bedetermined via DSC (differential scanning calorimetry) under these circumstances, because of decomposition of the test substance.

Key value for chemical safety assessment

Additional information

No melting or boiling point of Blendazol Red could bedetermined via DSC (differential scanning calorimetry) under these circumstances, because of decomposition of the test substance.