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Boiling point

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Reference
Endpoint:
boiling point
Type of information:
experimental study
Adequacy of study:
weight of evidence
Study period:
2002
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
study well documented, meets generally accepted scientific principles, acceptable for assessment
Remarks:
The study is well described and scientifically valid. The measurements were performed according to recognized international standard method.
Reason / purpose for cross-reference:
reference to same study
Qualifier:
according to guideline
Guideline:
other: ASTM D2879 "Standard Test Method for Vapor Pressure-Temperature Relationship and Initial Decomposition Temperature of Liquids by Isoteniscope"
Deviations:
no
Principles of method if other than guideline:
Since the Boiling Point is the temperature at which the Vapor Pressure of the liquid equals the atmospheric pressure and the liquid changes into a vapor, a value of Boiling Point can be derived from simultaneous measurements of Vapour Pressure and Temperature.
GLP compliance:
no
Type of method:
other: isoteniscope
Boiling pt.:
343.07 K
Atm. press.:
1 013.25 hPa

Measurements of Vapour pressure are summarized below:

Temperature Experimental
Vapour pressure P
K kPa
288.15 10,47
298.15 17,05
313.15 33,18
333.15 71,91
343.07 101,325

Since the Vapour Pressure of 2-[difluoro(methoxy)methyl]-1,1,1,3,3,3-hexafluoropropane equals the atmospherical pressure at the temperature of 343.07 K, this value can be take as temperature of Boiling Point.

Conclusions:
According to the reference, 2-[difluoro(methoxy)methyl]-1,1,1,3,3,3-hexafluoropropane has a boiling point of 343.07 K (69.92 °C) at the pressure of 1013.25 hPa.
Executive summary:

The study is focused on the experimental determination of Vapour Pressure for 50 hydrofluoroethers and on the calculation of the relevant Antoine Constants.

Under the study, the vapour pressure of 2-[difluoro(methoxy)methyl]-1,1,1,3,3,3-hexafluoropropane have been measured from pressure of less than 10.47 kPa to 101.325 kPa.

Since the Boiling Point is the temperature at which the Vapor Pressure of the liquid equals the atmospheric pressure, the value of Boiling Point can be derived from measurements of Vapour Pressure.

2-[difluoro(methoxy)methyl]-1,1,1,3,3,3-hexafluoropropane get the atmospheric pressure at the temperature of 343.07 K and therefore this value can be take as boiling point for the substance.

Description of key information

2-[difluoro(methoxy)methyl]-1,1,1,3,3,3-hexafluoropropane has a boiling point in the range from 68.5 °C to 70 °C under atmospheric pressure.

Key value for chemical safety assessment

Boiling point at 101 325 Pa:
69.92 °C

Additional information

Two publication are reported.

In the first one, the boiling point of 2-[difluoro(methoxy)methyl]-1,1,1,3,3,3-hexafluoropropane is reported to be 68.5 °C under atmospheric pressure. No details on method are given.

The second source is focused on the determination of the vapour pressure, the boiling point can be derived basing on the temperature at which the vapour pressure of the liquid equals the atmospheric pressure. The boiling point of 2-[difluoro(methoxy)methyl]-1,1,1,3,3,3-hexafluoropropane is derived to be 69.92 °C.

The two values are consistent and it can be concluded that the boiling point of 2-[difluoro(methoxy)methyl]-1,1,1,3,3,3-hexafluoropropane is in the range between 68.5 and 70 °C under atmospheric pressure.

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