Registration Dossier

Diss Factsheets

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
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
OECD Guideline 102 (Melting point / Melting Range)
Qualifier:
according to guideline
Guideline:
EU Method A.1 (Melting / Freezing Temperature)
Principles of method if other than guideline:
DTA/DSC
GLP compliance:
yes (incl. QA statement)
Type of method:
differential scanning calorimetry
Key result
Melting / freezing pt.:
>= 40 - <= 90 °C
Atm. press.:
1 013 hPa
Decomposition:
yes
Remarks:
The unsteady base line and inconstant thermal (approx. 230 °C and 450 °C) effects could be interpreted as decomposition (> 230 °C) of the test item.

Result:

No definite melting point could be determined.

In the closed crucible, two endothermic phases were visible between approx. 40 °C and approx. 90 °C indicating a large melting range.

This corresponds to the behaviour of the test item in the open crucible.

Conclusion:

Between 25 °C and 450 °C no definite melting could be observed. In the same temperature range no definite boiling point was detectable.

Two endothermic effects were visible between approx. 30 °C – 95 °C indicating a large melting range.

Between approx. 230 °C and 320 °C and approx. 330 °C and 450 °C further endothermic effects were observed. Since no steep endothermic signal could be detected there is no indication for a definite boiling point. The unsteady base line and inconstant thermal effects could be interpreted as decomposition of the test item.

The endothermic effects up to a temperature of 100 °C were verified in a second determination with reduced heating rate. The endothermic phases were likewise detected between approx. 40 °C and approx. 90 °C indicating a large melting range.

Melting range:approx. 40 – 90 °C

Conclusions:
No definite melting point could be determined for HPP 12879-1. Two endothermic phases were visible between approx. 40 °C and approx. 90 °C indicating a large melting range.
Executive summary:

A melting point study according to OECD 102 was performed using a Differential Thermal Analysis (DTA) / Differential Scanning Calorimetry (DSC).

No definite melting point could be determined for HPP 12879 -1. Two endothermic phases were visible between approx. 40 °C and approx. 90 °C indicating a large melting range.

Description of key information

No definite melting point could be determined. Two endothermic phases were visible between approx. 40 °C and approx. 90 °C indicating a large melting range.

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:
40 °C

Additional information

As melting starts at 40 °C this value was taken as melting point for the CSA.

Categories Display