Registration Dossier

Administrative data

Endpoint:
melting point/freezing point
Type of information:
experimental study
Adequacy of study:
key study
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:
liquid

Results and discussion

Melting / freezing point
Melting / freezing pt.:
-18.7 °C
Atm. press.:
ca. 101.3 kPa
Decomposition:
yes
Decomp. temp.:
> 275 °C
Sublimation:
no
Remarks on result:
other: result relates to glass transition temperature of the substance

Any other information on results incl. tables

During cooling, a glass transition was observed between -50°C and -10°C.  During heating, a glass transition was observed between -50°C and 0°C.  The inflection point of the glass transition was -19.304°C.  An endothermic peak was observed between 25°C and 275°C followed by an endothermic effect starting at 275°C.  The first endothermic effect was due to evaporation and the second one was due to reaction and/or decomposition of the test item.  

After the experiment, a yellow/brown residue remained in the sample container.

To investigate the endothermic peak between 25°C and 275°C, a repeated heating cycle was applied in the Experiment 2. Results of the first cooling were similar to what was found in Experiment 1. With the first heating the inflection point of the glass transition was -18.117°C.

During the second cooling, a glass transition between 25°C and 75°C was found. With the second heating, a glass transition was observed between 25°C and 75°C.  The inflection point of the glass transition was 50.563°C.  This inflection point was not used for calculating the glass transition temperature, since it was not obtained by melting of the original test item.  No other effects were observed during the second heating.  After the experiment, a yellowish residue remained in the sample container.

The glass transition temperature was determined as the mean glass transition temperature of Experiment 1 (-19.304°C) and Experiment 2 (-18.117°C).  Since the test item is a UVCB, a high difference between glass transition temperatures obtained in Experiment 1 and 2 was found. No melting point was determined.  A glass transition of the test item was observed at -18.7°C (254.4K). Reaction and/or decomposition of the test item was observed during DSC experiments at temperatures of > 275°C (> 548K).  

Applicant's summary and conclusion

Conclusions:
No melting point was determined under the conditions of the test. A glass transition of the test item was observed at -18.7°C. Reaction and/or decomposition of the test item was observed during DSC experiments at temperatures of > 275°C.