Polytetrafluoroethylene, Unfilled
Polytetrafluoroethylene (PTFE), unfilled [Teflon®]
Properties
- Chemical-resistant
- Low– and high-temperature resistant
- Weather-resistant
- Low coefficient of friction
- Electrical and thermal insulation
- Mechanical properties can be enhanced by adding fillers (eg, glass fibers, carbon, graphite, molybdenum disulphide, bronze)
Common uses
- Printed circuit boards
- Plain bearings, gears and slide plates
- Chute liners
- Wear strips
PTFE– (Teflon)
Material Specifications
| ASTM or UL test | Property | Unfilled |
Physical |
||
| D792 | Density (lb/in3)/(g/cm3) | 0.078 (2.16) |
| D570 | Water absorption, 24 hrs (%) | <0.01 |
Mechanical |
||
| D638 | Tensile strength (psi) | 3,900 |
| D638 | Tensile modulus (psi) | 81,000 |
| D638 | Tensile elongation at break (%) | 300 |
| D790 | Flexural strength (psi) | No break |
| D790 | Flexural modulus (psi) | 72,000 |
| D785 | Hardness, Shore | D50 |
| D256 | Izod notched impact (ft-lb/in) | 3.5 |
Thermal |
||
| D696 | Coefficient of linear thermal expansion (x 10–5 in./in./°F) |
7.5 |
| D648 | Heat deflection temp (F°/C°) at 264 psi | 132/55 |
| D3418 | Melting temp (F°/C°) | 635/335 |
| - | Max operating temp (F°/C°) | 500/260 |
| C177 | Thermal conductivity (BTU-in/ft²-hr-°F) |
1.70 |
| UL94 | Flammability rating | V-O |
Electrical |
||
| D150 | Dielectric constant at 1 MHz | 2.1 |
| D150 | Dissipation factor at 1 MHz | 0.0002 |
| D150 | Dielectric strength (V/mil) | 285 |
| D257 | Volume resistivity (ohm/cm) at 50% RH | >1018 |
These are typical values for reference and comparison only. They should not be used as a basis for design specifications or quality control. Contact us for the manufacturers’ complete material property datasheets. All values were taken at 73°F (23°C) unless otherwise noted.
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