Registration Dossier

Physical & Chemical properties

Melting point / freezing point

Currently viewing:

Administrative data

Link to relevant study record(s)

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
Reference:
Composition 0
Qualifier:
according to
Guideline:
OECD Guideline 102 (Melting point / Melting Range)
Version / remarks:
according to OECD 102 / 103 resp. EU A.1 / A2
Deviations:
no
GLP compliance:
no
Type of method:
differential scanning calorimetry
Test material information:
Composition 1
Specific details on test material used for the study:
The test substance was ground and dried in an agate mortar. Drying was done in an des-iccator at least overnight
Key result
Decomposition:
yes
Decomp. temp.:
>= 158.81 °C
Remarks on result:
not determinable

Aone-way aluminum crucible with perforated lid was prepared. 1.18 mg test substance was weighed into a one-way aluminium crucible. The weight of the crucible with the test substance was recorded with 47.49 mg. The crucible was heated in the muffle furnace from room temperature to 420 °C.

A second crucible was prepared without perforation with 1.26 mg test substance. The weight of the closed crucible was recorded with 34.00 mg.

After cooling down the crucibles was inspected for visual changes and the weight of the crucibles were recorded

The crucible containing the test substance was heated under inert gas from 15 to 350 °C using a heating rate of 10 K/min. As reference an empty crucible of the same kind was used. The heat flow and temperature were recorded by the DSC during the test. After the test the crucible was inspected for visual changes.

Observations Pre-test for melting and boiling point

Performances

Temperature in °C

Capillary with test item was set in an Aluminium block

20.4

No changes visible

At 124, 144 and 167 °C

Getting darker

197 °C

No further changes

220°C

More dark colour

280°C

Test terminated.

Test sample

completely black

350°C

 

No melting was visible, therefore the determination of the boiling point is not possible.


 

Conclusions:
No melting or boiling point of Blendazol Red could be determined 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 197 °C indicated by colour change. The bloated crucible after the DSC measurements and the remained black residue confirm the decomposition.
Therefore, beginning decomposition should be stated as:

158.81 °C (431.96 K)
Executive summary:

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

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