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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:
14-Jul to 04-Aug-2014
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Reason / purpose:
reference to same study
Qualifier:
according to
Guideline:
EU Method A.1 (Melting / Freezing Temperature)
Qualifier:
according to
Guideline:
OECD Guideline 102 (Melting point / Melting Range)
GLP compliance:
yes (incl. certificate)
Remarks:
Ministerium für Arbeit, Integration und Soziales des Landes Nordhein-Westfalen.
Type of method:
thermal analysis
Remarks:
Differential Scanning Calorimetry
Melting / freezing pt.:
-86 °C
Atm. press.:
1 013 hPa

Results

The DSC measurements were performed twice with slow controlled cooling rates (2 K/min).

 

Upon heating the heat flow showed a small endothermic peak (extrapolated onset: -121.31 °C/-120.86 °C; maximum: -119 °C) possibly caused by partial melting. This was followed by a weak exothermic effect, possibly due to phase transition or crystallisation.

 

Then a sharp endothermic peak with a maximum temperature at -84 °C could be observed representing the main melting peak. Its extrapolated onset temperature (-85.70 °C and -85.75 °C respectively) indicates the melting temperature; rounded mean value: -86 °C.

 

After the measurements the sample had lost 0.6/0.8% (by mass) of its original mass. The residue inside the crucible looked unchanged, it was colourless and liquid.

 

The melting temperature of the test item was determined by differential scanning calorimetry according to OECD Test Guideline 102 (adopted on 27 July 1995) and EU Method A.1 “Melting/freezing temperature”, Council Regulation (EC) No 440/2008 of 30 May 2008.  

 

Melting temperature: -86 °C

Conclusions:
A melting point value of -86°C at 1013 hPa was determined in a reliable study conducted according to an appropriate test protocol, and in compliance with GLP.

Description of key information

Diethoxy(dimethyl)silane: -86°C (1013 hPa)

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:
-86 °C

Additional information

A melting point value of -86°C (1013 hPa) was determined by differential scanning calorimetry according to EU Test Method A.1.