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Most PTFE seals, in order to retain their toughness and flexibility, are fortified with short glass fiber, bronze flashes, carbon, graphite, or a combination of these fillers. Because of a lack of resilience (memory) in PTFE, an energizer is most often employed to obtain the desired fit. Benefits are chemical inertness, high heat resistance, low temperature flexibility, low running friction, and non-adhesive characteristics. Temperatures to +500° F are obtainable but are often reduced by the filler or energizer employed.
PTFE is used in high heat applications because it is inflammable. They can be used in cryogenic as well as high temperatures (up to 300 ºC). A wide variety of fillings like carbon, glass fiber, polymers, and more can be made available with PTFE seals. PTFE seals offer thermal stability, the lowest known coefficient of friction (of nay solid), and extreme chemical resistance.
Data Sheet for PTFE (Polyetrafluorethylene) |
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| Mechanical Properties | Parameter | Value | Unit | DIN/EN/ISO/ASTM |
|---|---|---|---|---|
| Modulus of elasticity (tensile test) | 1mm/min | 2800 | MPa | 527-2 |
| Tensile strength | - | 22 | MPa | D4894 |
| Tensile strength at break | - | - | MPa | 527 |
| Elongation at break | - | 220 | % | D4894 |
| Shore hardness | Shore D | 55 | - | D2240 |
| Compression strength | 1% deformation | 5 | MPa | D695 |
| Ball indentation hardness | - | 30 | MPa | 2039/1 |
| Creep rupture strength after 1000hrs with static load | - | 5 | MPa | - |
| Coefficient of friction against hardened and ground steel P=0.05 N/mm2 , v=0.6m/s | - | 0.08-0.10 | - | - |
| Wear conditions as above | - | 21 | µm/km | - |
| Specific Gravity | D-792 | 1.32 | 1.49 | |
| Thermal Properties | Parameter | Value | Unit | DIN/EN/ISO/ASTM |
| Glass transition temperature | - | -20 | °C | 53765 |
| Crystalline melting point | - | 327 | °C | 53736 |
| Service temperature | Short term | 260 | °C | - |
| Service temperature | Long term | 260 | °C | - |
| Thermal expansion (CLTE) | 23-100°C, Long | 13 | 10-5K-1 | D696 |
| Specific heat | - | 1) | J/(g*K) | - |
| Thermal conductivity | - | 0.20 | W/(K*m) | C177 |
| Electrical Properties | Parameter | Value | Unit | DIN/IEC/ASTM |
| Surface resistance | - | 1016 | O | D257 |
| Specific volume resistance | - | 1017 | O*cm | D257 |
| Dielectric strength | In air, thickness 0.125mm | 80 | kV/mm | D149 |
| Dielectric constant | 50-109Hz | 2.1 | - | D150 Other |
| Other Properties | Parameter | Value | Unit | DIN/EN/ISO/IEC |
| Water absorption | 24h/96h (23°C) | 0.05/0.1 | % | 62 |
| Flammability (UL94) | Corresponding to | V0 | - | 60695-11-10 |
MSDS PTFE _ SSP