Property | ASTM Standard | Unit | PTFE | FEP | PFA |
Specific Gravity | D792 | — | 2.15 | 2.15 | 2.15 |
Tensile Strength | D638 | psi | 3000-5000 | 2800-5000 | 4000-4500 |
Elongation | D638 | % | 300-500 | 250-330 | 280-400 |
Flexural Modulus | D790 | MPa | 496 | 586 | 586 |
(psi) | -72,000 | -85,000 | -85,000 | ||
Folding Endurance | D2176 | (MIT) | >106 | 5-80 x 103 | 10-500 x 103 |
cycles | |||||
Impact Strength | D256 | J/m | 189 | No Break | No Break |
(ft·lb/in) | -3.5 | ||||
Hardness | D2240 | Shore D pencil | 50-65 HB | 56 | 60 |
HB | |||||
Coefficient of Friction, Dynamic | D1894 | — | 0.05-0.10 | 0.08-0.3 | — |
Property | ASTM Standard | PTFE | FEP | PFA |
Chemical/Solvent Resistance | D543 | Excellent | Excellent | Excellent |
Water Absorption 24h,% | D570 | <0.01 | <0.01 | <0.03 |
Deformation Under Load | *D621 100 ºC | 5 | 5 | 2.4 |
Deformation Under Load | **D621 25 ºC | 7 | 3 | 2.7 |
Refractive Index | 1.35 | 1.338 | 1.34 | |
Arc Resistivity, % Sec | D 495 | >300 | >300 | >300 |
>200 | >300 | >300 | ||
Limiting Oxygen Index, % | D2863 | >95 | >95 | >95 |
PROPERTY | UNIT | PTFE | FEP | PFA |
---|---|---|---|---|
Melting Point | °C | 327 | 260 | 305 |
(°F) | -621 | -500 | -582 | |
Upper Service | °C | 260 | 204 | 260 |
Temperature(20000h) | (°F) | -500 | -400 | -500 |
Flammability | UL 94 | V-0 | V-0 | V-0 |
Thermal Conductivity | 1.7 | 1.4 | 1.3 | |
BTU/hr/sq ft/deg F in | ||||
Thermal Conductivity Cal-cm/s-cm2, ºC | 6 x 10-4 | 6 x 10-4 | 6 x 10-6 | |
Linear Coefficient of Thermal Expansion | D 696 , 10-5 ºC | >11.6 | 8.3-10.5 | 13 |
Heat of Fusion | BTU/LB | 29-37 | 11 | 13 |
Heat of Combustion | BTU/LB | 2200 | 2200 | 2300 |
Low Temperature Embrittlement | °C | -268 | -268 | -268 |
(°F) | -450 | -450 | -450 |