Registration Dossier

Administrative data

Endpoint:
melting point/freezing point
Type of information:
experimental study
Adequacy of study:
key study
Study period:
Experimental period was 27 November 2017 to 29 November 2017
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 guidelineopen allclose all
Qualifier:
according to
Guideline:
OECD Guideline 102 (Melting point / Melting Range)
Deviations:
no
Qualifier:
according to
Guideline:
EU Method A.1 (Melting / Freezing Temperature)
Deviations:
no
Qualifier:
according to
Guideline:
EPA OPPTS 830.7200 (Melting Point / Melting Range)
Deviations:
no
GLP compliance:
yes
Type of method:
differential scanning calorimetry

Test material

Reference
Name:
Unnamed
Type:
Constituent
Test material form:
solid: particulate/powder
Specific details on test material used for the study:
Identification: ATZ
Appearance: Blue to grey powder
Batch: 013072810B
Purity/Composition: 100%
Test item storage: At room temperature
Stable under storage conditions until: 30 September 2019 (expiry date)

Results and discussion

Melting / freezing point
Key result
Melting / freezing pt.:
ca. 244.2 °C
Atm. press.:
ca. 1 atm
Decomposition:
yes
Decomp. temp.:
244.2 °C
Sublimation:
no

Any other information on results incl. tables

In experiment 1. An endothermic peak was observed between 200°C and 275°C followed by a strong exothermic effect starting at 350°C. The extrapolated onset temperature of the first peak was 244.129°C. The endothermic effect was most likely obtained due to melting of the test item. The exothermic effect was probably obtained due to reaction and/or decomposition of the test item.

After the experiment, a black molten residue remained in the sample container (original colour: blue to grey). Based on this visual observation, it was found that the test item had molten and the change of the colour demonstrated reaction and/or decomposition of the test item.

In order to investigate the melting peak, Experiment 2 was stopped directly after the melting peak. The extrapolated onset temperature was 244.335°C. After the experiment, an orange molten residue remained in the sample container (original colour: blue to grey). Based on this visual observation, it was found that the test item had molten and the change of the colour demonstrated reaction and/or decomposition of the test item.

The melting temperature was determined as the mean melting temperature of Experiment 1 (244.129°C) and Experiment 2 (244.335°C).

Applicant's summary and conclusion

Conclusions:
The melting and boiling temperature of ATZ were determined by DSC.
The melting temperature of the test item was 244.2°C (537.4K).
Reaction and/or decomposition of the test item was observed during melting at the DSC experiments.
Executive summary:

The melting and boiling temperature of ATZ were determined by DSC.

The melting temperature of the test item was 244.2°C (537.4K).

Reaction and/or decomposition of the test item was observed during melting at the DSC experiments.