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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
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: Test procedure in accordance with national standard methods (OECD) without GLP.
Qualifier:
according to guideline
Guideline:
OECD Guideline 102 (Melting point / Melting Range)
GLP compliance:
no
Type of method:
method to determine freezing temperature
Specific details on test material used for the study:
- Name of test material (as cited in study report): Alcohols, C2-33, manuf. of, by-products from overheads
- Substance type: Product, HF-1000
- Physical state: clear colourless liquid
- Odour: oily/solvent
- Lot/batch No.: 1881046
Melting / freezing pt.:
< -20 °C
Atm. press.:
1 atm
Decomposition:
no
Sublimation:
no

Equipment:

Type: TA Instruments Q1000 DSC

Calibration:

calibration material: Indium and cyclohexane

melting point (theory): Indium: 157.01 °C; cyclohexane: 6.45 °C

melting point (experimental): indium: 156.55 °C; 6.53 °C

Substance analysis:

The test substance, Alcohols, C2-33, manuf. of, by-products from overheads was analysed by heating in a sealed pan from -80 °C to 25 °C at the heating rate of 10 °C/min. This was then held isothermally for 10 mins at 25 °C and then cooled down to -80 °C at a heating rate of 10 °C/min. A nitrogen purge gas was used.

Results:

The heating trace shows a thermal transition occuring between -12.8 °C and -14.72 °C. No melt was observed.

The cooling trace shows a thermal transition occuring between -18.22 °C and -18.93 °C, which could be a differential cooling of some of the test substance components. A second thermal transition appears at -58.8 °C.

Conclusions:
The test substance clearly freezes below -20 °C by visual assessment and this is supported by the thermal event in the DSC cooling trace at -58.8 °C. There is a temperature releated event at between 4 °C and -20 °C that again is supported by the thermal cooling trace at approximateley -18 °C that indicates some sort of transition or crystallisation is occuring. As the test substance is a UVCB, this could be due to some components in the test substance starting the freezing process.
Executive summary:

Hydrocarbons, C12-C16, n-alkanes, isoalkanes, alkenes is measured according to OECD 102.

The freezing point was determind to be below -20 °C.

Description of key information

Key value for chemical safety assessment

Additional information

The freezing point below -20 °C was measured in a reliable study .

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