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Vapour pressure

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Reference
Endpoint:
vapour pressure
Type of information:
experimental study
Adequacy of study:
key study
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:
not specified
GLP compliance:
no
Type of method:
isoteniscope
Temp.:
288.15 K
Vapour pressure:
10.47 kPa
Temp.:
298.15 K
Vapour pressure:
17.05 kPa
Temp.:
313.15 K
Vapour pressure:
33.18 kPa
Temp.:
333.15 K
Vapour pressure:
71.91 kPa
Temp.:
343.07 K
Vapour pressure:
101.325 kPa

Temperature Vapour pressure P
Experimental
Vapour pressure P
Calculated
dP
K kPa kPa kPa
288.15 10,470 10,460 0,01
298.15 17,050 17,080 -0,03
313.15 33,180 33,170 0,01
333.15 71,910 71,880 0,03
343.07 101,325 101,360 -0,03

Antoine Constants
A B C
6,17743 1197,966 -55,90

Avarage absolute deviation (AAD) = 0.075 %

------------------------

Antoine equation:

log(P) = A - ( B / (T + C))

where:

P = Vapour pressure (kPa)

T = temperature (K)

Conclusions:
2-[difluoro(methoxy)methyl]-1,1,1,3,3,3-hexafluoropropane show the following values of vapour pressure:
- 10.47 kPa at 288.15 K
- 17.05 kPa at 298.15 K
- 33.18 kPa at 313.15 K
- 71.91 kPa at 333.15 K
- 101.325 kPa at 343.07 K
Executive summary:

Under the study, vapour pressure for 50 hydrofluoroethers have been measured from pressure of less than 30 kPa to 101.3 kPa. Measurements were made by the isoteniscope method. The Antoine constants for each compound were derived using experimental data. The fit was made by weighting all data equally. Values of vapour pressure were calculated at the same temperature of experimental data, the average absolute deviations (AADs) between calculated and experimental value is reported.

The vapour pressure of 2-[difluoro(methoxy)methyl]-1,1,1,3,3,3-hexafluoropropane was measured in the range from 288.15 to 343.07 K. The following values were determined:

- 10.47 kPa at 288.15 K

- 17.05 kPa at 298.15 K

- 33.18 kPa at 313.15 K

- 71.91 kPa at 333.15 K

- 101.325 kPa at 343.07 K

The following Antoine constants were calculated:

A =6,17743, B = 1197,966, C = -55,90 (P in kPa, and T in K)

Description of key information

2-[difluoro(methoxy)methyl]-1,1,1,3,3,3-hexafluoropropane shows the

following values of vapour pressure:
- 10.47 kPa at 288.15 K
- 17.05 kPa at 298.15 K
- 33.18 kPa at 313.15 K
- 71.91 kPa at 333.15 K
- 101.325 kPa at 343.07 K

Key value for chemical safety assessment

Vapour pressure:
170.5 hPa
at the temperature of:
25 °C

Additional information

A reliable study is reported. Under the study, the vapour pressure for 50 hydrofluoroethers have been measured and the Antoine constants for each compound have been derived.

The measurements of vapour pressure have been performed according to recognized international standard method.

2-[difluoro(methoxy)methyl]-1,1,1,3,3,3-hexafluoropropane shows the following values of vapour pressure:

- 10.47 kPa at 288.15 K

- 17.05 kPa at 298.15 K

- 33.18 kPa at 313.15 K

- 71.91 kPa at 333.15 K

- 101.325 kPa at 343.07 K

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