Summery of properties for PTFE,PFA and FEP
|
Property |
Specification |
Unit |
Material |
||
|
(ASTM) |
PTFE |
PFA |
FEP | ||
| General | |||||
| Continuous service temperature | Maximum | °C | 260 | 260 | 200 |
| ° F | 500 | 500 | 392 | ||
| Chemical resistance |
- |
Excellent | Excellent | Excellent | |
| Specific gravity | D 792 | - | 2.15 | 2.15 | 2.15 |
| Electrical | |||||
| Dielectric constant | D 150 at 103 Hz |
- |
2.1 |
2.1 | 2.1 |
| D 150 at 106 Hz |
- |
2.1 | 2.1 | 2.1 | |
| Dielectric dissipation factor | D 150 at 103 Hz |
- |
0.0002 | 0.0002 | 0.0001 |
| D 150 at 106 Hz | - | 0.0002 | 0.0003 | 0.0008 | |
| Dielectric strength (short term) 10 mils film |
D 149 | Volt/mil | > 1 400 | 2 000 | 2 000 |
| Volume resistivity |
D 257 |
Ohm·cm |
>1018 | >1018 | >1018 |
| Enviromertal | |||||
| Water absorption | D 570 | % | < 0.01 | < 0.03 | <0.01 |
| Weather resistance | - | - | Excellent | Excellent | Excellent |
| Oxygen index | D 2863 | % | > 95 | > 95 | >95 |
| Flammability | UL 94 | - | V-0 | V-0 | V-0 |
| Mechanical | |||||
| Tensile strength |
D 1708, D 638 |
psi | 3 500 | 4 000 | 3 500 |
| Elongation | D 1708, D 638 | % | 300 | 300 | 300 |
| Compressive strength | D 695 | psi | 3 500 | 2 200 | 2 200 |
| Impact strength | D 256 at +23°C | Ft-Lb/in | 3.5 | No Break | No Break |
| Flexural Modulus | D 790 at +23°C | psi | 90 000 | 100 000 | 95 000 |
| Tensile Modulus | D 638 | psi | 80 000 | 40 000 | 50 000 |
| Hardness | D 2240 | - | D-60 | D-60 | D-55 |
| Thermal | |||||
| Melting point | ° C | 327 | 305 | 270 | |
| ° F | 620 | 581 | 518 | ||
| Thermal conductivity | C-177 | BTU/hr/ft2 /°F.in |
1.7 | 1.3 | 1.4 |
| Deflection temperature 66 psi 264 psi |
D 648 |
° C | 122 55 |
74 48 |
59 57 |
| Deflection temperature 66 psi 264 psi |
D 648 | ° F | 252 131 |
166 118 |
138 134 |