VIRGIN PTFE DATA SHEET
PTFE = Polytetrafluoro ethylene
PFA = Perfluoro alkoxy
FEP = Fluorinated ethylene propylene
ETFE = Ethylene tetrafluoro ethylene
PVDF = Polyvinylidene fluorid
| Property | ASTM test | PTFE | PFA | FEP | ETFE | PVdF |
| Physical properties | ||||||
| Specific gravity | D792 | 2.15 | 2.15 | 2.15 | 1.73 | 1.78 |
| Water absorption ( % ) | D570 / 24 hrs 1/3" t | < 0.00 | 0.03 | < 0.01 | < 0.1 | 0.04 |
| Mold shrinkage ( cm / cm ) | 0.02 – 0.05 | 0.04 | 0.03 - 0.06 | 0.03 – 0.04 | 0.014 | |
| Contact angle ( degree ) | Angle to level | 110 | 115 | 115 | 96 | 82 |
| Thermal properties | ||||||
| Thermal conductivity ( cal / sec / cm2, oC / cm ) |
C177 | 6 x 10-4 | 6 x 10-4 | 6 x 10-4 | 5.7 x 10-4 | 4.5 x 10-4 |
| Coefficient of linear thermal expansion ( 1 / oC ) |
D696 / 23 - 60oC | 10 x 10-5 | 12 x 10-5 | 8 - 10 x 10-5 | 5 - 9 x 10-5 | 7 x 10-5 |
| Melting point ( oC ) | 327 | 302 - 310 | 270 | 260 | 173 - 175 | |
| Melt viscosity ( poise ) | 1011 – 1013 (340 - 380oC) |
104 – 105 (380oC) |
4 x 104- 105 (380oC) |
104- 105 (300 - 330oC) |
1.8 x 104 (220oC) |
|
| Maximum temp for continuos use ( oC / oF ) |
260 / 500 | 260 / 500 | 200 / 392 | 150 / 302 | 150 / 302 | |
| Mechanical properties | ||||||
| Tensile strength ( kgf / cm2 ) |
D638 / 23oC | 140 - 350 | 280 - 315 | 190 - 220 | 410 - 470 | 400 - 600 |
| Elongation ( % ) | D638 / 23oC | 200 - 400 | 280 - 300 | 250 - 330 | 420 - 440 | 300 - 450 |
| Compression strength ( kgf / cm2) |
D695 / 1 % deformation, 25oC |
50 - 60 | 50 - 60 | 50 - 60 | 109 | 128 - 140 |
| Tensile modulus ( kgf / cm2 ) |
D638 / 23oC | 4,000 | 3,800 | 3,500 | 5,000 – 8,000 | 8,000 – 20,000 |
| Flexural modulus ( kgf / cm2 ) |
D790 / 23oC | 5,000 – 6,000 | 6,600 – 7,000 | 5,500 – 6,500 | 9,000 – 14,000 | 14,000 – 18,000 |
| Impact strength ( ft - lb / in ) |
D256 / 23oC, Izod | 3.0 | No breakdown | No breakdown | No breakdown | 20.7 |
| Hardness ( Shore ) | Durometer | D50 - D65 | D60 | D55 | D75 | D79 |
| Deformation under load ( % ) |
D621 / 100oC, 70 kgf / cm2, 24 hrs D621 / 25oC, 140 kgf / cm2, 24 hrs |
5.0 7.0 | 2.4 2.7 | 5.0 3.0 | 5.4 2..3 | 2.4 0.7 |
| Static friction coefficient | Coated - steel surface | 0.02 | 0.05 | 0.05 | 0.06 | 0.4 |
| Electrical properties | ||||||
| Dielectric constant | D150 / 103 Hz D150 / 106 Hz |
2.1 2.1 |
2.1 2.1 |
2.1 2.1 |
2.6 2.6 |
7.2 8.5 |
| Dielectric dissipation factor |
D150 / 103 Hz | < 1 x 10-5 | 1 x 10-5 | 6 x 10-5 | 8 x 10-4 | 1.3 x 10-3 |
| Dielectric breakdown strength ( V / mil ) |
D149 / Short time, 1/ 8 in |
480 | 500 | 500 - 600 | 400 | 260 |
| Volume resistivity ( ohm - cm ) |
D257 | > 1018 | > 1018 | > 1018 | > 1016 | 1.5 x 1014 |
| Chemical resistance | Excellent | Excellent | Excellent | Excellent | Good | |
| Weatherability | Excellent | Excellent | Excellent | Excellent | Excellent | |
| Combustibility ( % ) | D2863 / Oxygen concentration index |
> 95 | > 95 | > 95 | 31 | 43 |