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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:
08 July 2010-28 July 2010
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: This study has been performed according to OECD and EC guidelines and according to GLP principles.
Qualifier:
according to guideline
Guideline:
OECD Guideline 102 (Melting point / Melting Range)
Deviations:
no
Qualifier:
according to guideline
Guideline:
EU Method A.1 (Melting / Freezing Temperature)
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Type of method:
other: differential scanning calorimetry (DSC)
Melting / freezing pt.:
< -20 °C
Atm. press.:
1 018 hPa

Preliminary test:

From 300°C upwards the weight of the sample decreased significantly. At 383°C the sample weight had decreased by 25%. After the experiment, a small dark brown residue remained in the lid of the sample container (original colour: colourless).

Main study:

In the first experiment, during cooling no effects were observed which were due to crystallization of the test substance. Heating showed an endothermic effect above 200°C, which was probably caused by evaporation. The extrapolated onset temperature could not be determined because evaporation continued above 400°C. After the experiment, the consistency appeared to have been unchanged.

 

During the second and third experiment, a higher end temperature was used in order to determine the extrapolated onset of the boiling temperature. Both DSC-curves showed an endothermic peak between 300°C and 450°C with an extrapolated onset of 385.33°C (second experiment) and 384.56°C (third experiment). After the experiment, a small dark brown residue was observed in the sample container.

 

Additionally, the test substance was stored overnight in a -20°C freezer in order to determine if crystallization occurs. After storage the test substance had not been crystallized. From this it was concluded that the melting temperature is < -20°C (< 253K).

Conclusions:
The melting temperature of Diisodecyl adipate was determined using DSC. The melting temperature of the test substance is < -20°C (< 253 K). The atmospheric pressure was 1018 ± 1 hPa.

Description of key information

In a GLP study according to OECD and EU guidelines, the melting/freezing point of diisodecyl adipate was determined to be < -20 degr C.

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:
-20 °C

Additional information