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EC number: 204-126-9 | CAS number: 116-14-3
Vapour pressure
Administrative data
Link to relevant study record(s)
Description of key information
The vapour pressure of tetrafluoroethylene was determined at thermodynamic equilibrium between gas and liquid phases for temperatures between -32 and +31.4°C. Between +2 and 24.3°C the vapour pressure of TFE ranged between 17300 and 32395 hPa.Close agreement between the results obtained in this work by ICI and earlier work by DuPont was demonstrated.
Key value for chemical safety assessment
Additional information
Table A. TFE Vapour Pressure vs Temperature - Experimental Measurements
Temp °C |
VP hPa |
-32.0 |
5859 |
-28.0 |
6755 |
-21.5 |
8616 |
-12.0 |
11855 |
+2.0 |
17300 |
+14.5 |
25020 |
+24.3 |
32395 |
+29.7 |
35979 |
+31.2 |
37220 |
+31.4 |
37358 |
The experimental data can be represented by the two equations:
at -32 to 0°C
log10P = 4.9258 - 580.2 / T + 230
at 0 to 33°C
log10P = 5.2717 - 659.6 / T + 230
where P = pressure (psia) and
T = temperature (°C)
Results calculated from these equations were compared with those obtained in earlier work by DuPont
Table B: Vapour Pressure (VP) of TFE vs Temperature (T°C) Comparison of Smoothed Results from this work (ICI) with DuPont Values
T °C |
VP hPa (ICI) |
VP hPa (DuPont) |
-76.6 |
- |
1013 |
-75.5 |
1013 |
- |
-60 |
2275 |
2206 |
-50 |
3446 |
3446 |
-40 |
5101 |
5032 |
-30 |
7306 |
7237 |
-20 |
10063 |
9994 |
-10 |
13372 |
13509 |
0 |
17438 |
17920 |
10 |
23021 |
23297 |
20 |
29638 |
29569 |
30 |
37429 |
36944 |
33* |
39977 |
39564 |
*critical temperature and pressure
Thus from the comparison of results in Table B good agreement is confirmed between this work by ICI and that conducted earlier by DuPont.
Using the ICI equation at vapour pressure of 33.5 bar can be calculated for TFE at 25°C. This value compares well with that of 33.1 bar obtained at the same temperature by Renfrew and Lewis (1946) using the equation logVP (psi) = 5.5906 - 866.84/T, where T is in Kelvin.
Reference
Renfrew MM, Lewis EE, 1946. Polytetrafluoroethylene: Heat-resistant, chemically inert plastic. Industrial and Engineering Chemistry 38(9), 870 - 877.
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