Polytetrafluoroethylene-Properties-Circuit Board Electronic Pcb
- Dec 31, 2016-
Polytetrafluoroethylene-Properties-
Circuit Board Electronic Pcb
Properties
PTFE is often used to coat non-stick pans as it is hydrophobic and possesses fairly high heat resistance.
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PTFE is a thermoplastic polymer, which is a white solid at room temperature, with a density of about 2200 kg/m3. According to DuPont, its melting point is 600 K (327 °C; 620 °F). It maintains high strength, toughness and self-lubrication at low temperatures down to 5 K (−268.15 °C; −450.67 °F), and good flexibility at temperatures above 194 K (−79 °C; −110 °F). PTFE gains its properties from the aggregate effect of carbon-fluorine bonds, as do all fluorocarbons. The only chemicals known to affect these carbon-fluorine bonds are highly reactive metals like the alkali metals, and at higher temperatures also such metals as aluminium and magnesium, and fluorinating agents such as xenon difluoride and cobalt(III) fluoride.
| Property | Value |
|---|
| Density | 2200 kg/m3 |
| Glass temperature | 388 K |
| Melting point | 600 K |
| Thermal expansion | 112–125 · 10−6 K−1 |
| Thermal diffusivity | 0.124 mm2/s |
| Young's modulus | 0.5 GPa |
| Yield strength | 23 MPa |
| Bulk resistivity | 1016 Ω·m |
| Coefficient of friction | 0.05–0.10 |
| Dielectric constant | ε = 2.1, tan(δ) < 5(-4) |
| Dielectric constant (60 Hz) | ε = 2.1, tan(δ) < 2(-4) |
| Dielectric strength (1 MHz) | 60 MV/m
|
