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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
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
GLP compliance:
yes
Type of method:
thermal analysis
Specific details on test material used for the study:
Clear colourless liquid, purity 96.5%.
Key result
Melting / freezing pt.:
>= -25 - <= -21 °C
Decomposition:
no
Sublimation:
no
Remarks on result:
other: The test substance showed a clear transition phase from liquid to solid.
Remarks:
Because the resulting freezing temperature differed more than 1 K, a range is reported. Probably due to undercooling effects. The method is validated periodically using n-octane and water.

Preliminary test:

Temperature range during storing (°C)

Test substance appearance after 1 hour

Test tube turned upside down

Test substance appearance after an additional hour

3.8to 5.3

Clear colour less

No

Clear colour less

-23.5 to -22.9

Turbid

No

Turbid

-82.4 to -81.4

White solid

Yes

White solid, test substance did not flow downwards

Freezing is expected to occur between -82  °C and -23 °C

Main study:determination freezing temp.

The lowest temperatures measured in the four tests were; -16.4, ≤-24.6, -20.8, -25.3. At -16.4 the test substance was still liquid. Therefore this temp. was not used as a freezing temp. 
Conclusions:
Determined the freezing range for pentamethyl-trioxepane from -25 to -21°C
Executive summary:

Determined the freezing range for pentamethyl-trioxepane from -25 to -21°C

Description of key information

Determined the freezing range for pentamethyl-trioxepane from -25 to -21°C

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:
-21 °C

Additional information