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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:
05/Jul/04 - 12/Oct/04
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
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
Type of method:
method to determine freezing temperature
Specific details on test material used for the study:
Asahiklin AE-3000, molecular weight 200.7
CAS 406-78-0
Clear colourless liquid
Batch 50407070
Purity: 99.985%
The test substance was stored in a refrigerator in the dark under stable conditions
The test substance expiry date was the 07 July 2005
Key result
Melting / freezing pt.:
< -81 °C

The freezing temperature is defined as the temperature at which the phase transition from liquid to solid state takes place at normal atmospheric pressure. This temperature ideally corresponds to the solidification or freezing temperature.

The table below summaries the temperatures and the visual observations during the preliminary screening test:

Temperature range during storage [°C]

 Test substance appearance after 1 hour  Test substance appearance after an additional 1 hour period

 4.1 to 5.1

 Clear colourless liquid   Clear colourless liquid
 -26.0 to -24.3  Clear colourless liquid   Clear colourless liquid
 -82.6 to -81.4 Clear colourless liquid   Clear colourless liquid
Conclusions:
The freezing temperature for 1,1,2,2-tetrafluoroethyl-2,2,2-trifluoroethyl ether was determined to be < -81°C
Executive summary:

An experiment was carried out to determine the freezing point of 1,1,2,2-tetrafluoroethyl-2,2,2-trifluoroethyl ether. Three test tubes were filled with 5mL of the test substance and stored at temperatures of 4.1/ 5.1°C, -26.0/ -24.3°C

and -82.6/ -81.4°C respectively. After storage for 2 hours at these temperatures, 1,1,2,2-tetrafluoroethyl-2,2,2-trifluoroethyl ether remained a clear, colourless liquid with no indication of solidification or the freezing process. The freezing temperature of 1,1,2,2-tetrafluoroethyl-2,2,2-trifluoroethyl ether was therefore deemed to be <81°C and resultantly no main study was performed.

Description of key information

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:
-81 °C

Additional information