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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:
03/AUG/04 - 19/NOV/04
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
EU Method A.4 (Vapour Pressure)
Deviations:
no
Qualifier:
according to guideline
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
Deviations:
no
GLP compliance:
yes
Type of method:
static method
Specific details on test material used for the study:
Asahiklin AE-3000, molecular weight 200.07
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
Temp.:
20 °C
Vapour pressure:
30.78 kPa

The measured vapour pressures are their natural logarithms are summarised below and are expressed in kPa. The values given are rounded values:

36.92°C (310.07 K)

30.49°C (303.64 K)

23.31°C (296.46 K)

 nr

p/kPa

Ln (p/Pa)

 nr

p/kPa

Ln (p/Pa)

 nr

p/kPa

Ln (p/Pa)

1*

58.86

10.98

15

46.14

10.74

24*

35.42

10.48

2*

58.61

10.98

16

46.13

10.74

25

35.27

10.47

3

58.39

10.97

17

46.14

10.74

26

35.13

10.47

4

58.29

10.97

18

46.08

10.74

27

35.06

10.46

5

58.17

10.97

19

46.10

10.74

28

34.96

10.46

6

58.11

10.97

20

46.15

10.74

29

34.90

10.46

7

58.06

10.97

21

46.10

10.74

30

34.92

10.46

8

58.03

10.97

22

46.08

10.74

31

34.90

10.46

9

57.99

10.97

23

46.07

10.74

 

 

 

10

57.91

10.97

 

 

 

 

 

 

11

57.9

10.97

 

 

 

 

 

 

12

57.87

10.97

 

 

 

 

 

 

13

57.85

10.97

 

 

 

 

 

 

14

57.83

10.97

 

 

 

 

 

 

 * System instability - measurement not used for calculation

Vapour pressure of 1,1,2,2-tetrafluoroethyl-2,2,2-trifluoroethyl ether at 3 different temperatures:

Measurement

Temperature

Mean vapour pressure±2 x calculated error [pa]

[°C]

[K]

p

ln p

3-14

36.92

310.07

58033 ± 286

10.969 ± 0.005

15-23

30.49

303.64

46111 ± 51

10.739 ± 0.001

25-31

23.31

296.46

35020 ± 227

10.464 ± 0.006

 

Fitting these data using the least squares method gave a value of 30.78kPa for the vapour pressure of the test substance at 20°C.

Conclusions:
The vapour pressure for 1,1,2,2-tetrafluoroethyl-2,2,2-trifluoroethyl ether was determined as:

p (20°C) = 30.8 ± 0.4kPa = 231 ± 3 mmHg
Executive summary:

An experiment was carried out to determine the vapour pressure of 1,1,2,2-tetrafluoroethyl-2,2,2-trifluoroethyl ether using the static technique.

A total of 31 measurements were made with a capacitance manometer, at temperatures of 36.92°C, 30.49°C and 23.31°C respectively. Fitting of the data obtained using the least squares method gave a value of p (20°C) = 30.8 ± 0.4kPa = 231 ± 3 mmHg for the vapour pressure of 1,1,2,2-tetrafluoroethyl-2,2,2-trifluoroethyl ether

Description of key information

Key value for chemical safety assessment

Vapour pressure:
30.78 kPa
at the temperature of:
20 °C

Additional information

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