FEP Properties
Fluorinated Ethylene Propylene
Tef Cap’s Thin Wall PTFE Tubing is well suited for a variety of demanding chemical, mechanical, electrical and non-stick surface applications. Conforming to Mil-I-22129, AMS 3655 and ASTM-D-3295, PTFE Tubing is rated for continuous operations from -70°C to +260°C (500°F) and will always remain flexible. Polytetrafluoroethylene is resistant to wicking, moisture absorption and contamination in harsh environments. PTFE tubing is non-toxic and will not burn in normal atmosphere at any temperature, and is chemically inert to all lubricants, solvents and reagents. Its electrical performance is excellent, offering extremely high dielectric strength and protection.
| Properties | Units / ASTM | FEP |
|---|---|---|
| MECHANICAL PROPERTIES | ||
| Specific Gravity | D792 | 2.15 |
| Elongation % | D638 | 250 - 330 |
| Tensile Strength (psi) | D638 | 2,800 - 5,000 |
| Flexural Strength (psi) | D790 | No Break |
| Compressive Strength | D695 | 2,200 |
| Tensile Elastic Modulus (Young's Modulus) (psi) | D638 | 50,000 |
| Flexural Modulus 103MPa (103kgf/cm2) | D790 | 78,000 - 92,000 |
| Flex Life (MIT cycles) | D2176 | 5,000 - 80,000 |
| Hardness Durometer Shore D | D636 | D55 |
| Coefficient of Friction on steel | .05 | |
| Abrasion Resistance 1000 revs. | Taber | 14 - 20 |
| Impact Strength IZOD 73°F/23°C, notched ft/lbs/in | D256 | No Break |
| THERMAL PROPERTIES | ||
| Melting Point | °F | 500 |
| Upper Service Temperature (20,000h) | °F | 400 |
| Flame Rating | UL 94 | V-O |
| Thermal Conductivity | BTU/hr/ft2/deg °F in | 1.4 |
| Linear Coefficient of Thermal Expansion | D696 | 8.3 - 10.5 |
| Heat of Fusion | BTU/LB | 11 |
| Heat of Combustion | BTU/LB | 2,200 |
| Low Temperature Embrittlement | °F | -450 |
| ELECTRICAL PROPERTIES | ||
| Dielectric Constant | D150/103Hz ( 106Hz ) | 2.1 |
| Dielectric Strength 10 mil film | D149 | >2,000 |
| Volume Resistivity ohm-cm | D257 | >10^18 |
| Surface Resistivity ohm/sq. | D257 | >10^17 |
| GENERAL PROPERTIES | ||
| Chemical/Solvent Resistance | D543 | Excellent |
| Water Absorption, 24hr / % | <0.01 | |
| Deformation Under Load | D621/110°C | 5.0 |
| Refractive Index | 1.338 | |
| Limiting Oxygen Index % | >95 |