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Melting point / freezing point

Link to relevant study record(s)

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.

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:

-81 °C