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Physical & Chemical properties

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:
2019-08-08 to 2019-10-08
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
EU Method A.1 (Melting / Freezing Temperature)
Deviations:
no
Qualifier:
according to guideline
Guideline:
OECD Guideline 102 (Melting point / Melting Range)
Deviations:
no
GLP compliance:
no
Type of method:
differential scanning calorimetry
Key result
Melting / freezing pt.:
<= -50 °C
Atm. press.:
1 013 hPa
Decomposition:
no
Sublimation:
no

Table 1: Melting point (DSC measurements)




































Ident


No.



Test item / mg



Starting


temperature / °C



Final test


temperature / °C



Temperature range (endo-


thermal) / °C



Onset (melting) / °C



Crucible



Observations


after the


measurement



38775



16.15



-80



25



---



---



Aluminium


with a hole



Test item was


unchanged



38776



14.40



-80



25



---



---



Aluminium


with a hole



Test item was


unchanged



No melting point was measured above -80 °C. However, since melting may be hindered at low temperatures due to supercooling it should only be assumed that no melting point exists above -50 °C.

Conclusions:
No melting point of the test item exists above -50 °C at 1013 hPa.
Executive summary:

A study was conducted according to OECD TG 102 and Regulation (EC) No 440/2008 method A.1 to determine the melting point of the test item using differential scanning calorimetry. The test item and the reference were heated up from the starting temperature to the final temperature at a constant heating rate in a defined atmosphere (nitrogen). Aluminium crucibles with hole were used as containers for the test item and the reference. In two measurements, no exothermal or endothermal effects were observed during cooling down and heating up. No melting point was measured above -80 °C. However, since melting may be hindered at low temperatures due to supercooling it should only be assumed that no melting point exists above -50 °C.

Description of key information

No melting point of the test item exists above -50 °C at 1013 hPa (reference 4.2-1).

Key value for chemical safety assessment

Additional information

A study was conducted according to OECD TG 102 and Regulation (EC) No 440/2008 method A.1 to determine the melting point of the test item using differential scanning calorimetry. The test item and the reference were heated up from the starting temperature to the final temperature at a constant heating rate in a defined atmosphere (nitrogen). Aluminium crucibles with hole were used as containers for the test item and the reference. In two measurements, no exothermal or endothermal effects were observed during cooling down and heating up. No melting point was measured above -80 °C. However, since melting may be hindered at low temperatures due to supercooling it should only be assumed that no melting point exists above -50 °C.