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As we know, PTFE is kind of the superman in filter materials choosing due to its marvelous chemical properties. Moreover, with the over rising of water and energy issue, PTFE has established its solid reputation for its numerous applications.
PTFE’s advantages at a glance:
| 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 |
| Magnetic Susceptibility (SI, 22 °C) | −10.28×10−6 |
The major application of PTFE, consuming about 50% of production, is for wiring in aerospace and computer applications (e.g. hookup wire, coaxial cables). This application exploits the fact that PTFE has excellent dielectric properties. This is especially true at high radio frequencies, making it suitable for use as an insulator in cables and connector assemblies and as a material for printed circuit boards used at microwave frequencies. Combined with its high melting temperature, this makes it the material of choice as a high-performance substitute for the weaker and lower-melting-point polyethylene commonly used in low-cost applications.
In industrial applications, owing to its low friction, PTFE is used for applications where sliding action of parts is needed: plain bearings, gears, slide plates, etc. In these applications, it performs significantly better than nylon and acetal; it is comparable to ultra-high-molecular-weight polyethylene (UHMWPE). Although UHMWPE is more resistant to wear than PTFE, for these applications, versions of PTFE with mineral oil or molybdenum disulfide embedded as additional lubricants in its matrix are being manufactured. Its extremely high bulk resistivity makes it an ideal material for fabricating long-life electrets, useful devices that are the electrostatic analogues of magnets.
PTFE film is also widely used in the production of carbon fiber composites as well as fiberglass composites, notably in the aerospace industry. PTFE film is used as a barrier between the carbon or fiberglass part being built, and breather and bagging materials used to incapsulate the bondment when debulking (vacuum removal of air from between layers of laid-up plies of material) and when curing the composite, usually in an autoclave. The PTFE, used here as a film, prevents the non-production materials from sticking to the part being built, which is sticky due to the carbon-graphite or fiberglass plies being pre-pregnated with bismaleimide resin. Non-production materials such as Teflon, Airweave Breather and the bag itself would be considered F.O.D. (foreign object debris/damage) if left in layup.
Because of its extreme non-reactivity and high temperature rating, PTFE is often used as the liner in hose assemblies, expansion joints, and in industrial pipe lines, particularly in applications using acids, alkalis, or other chemicals. Its frictionless qualities allow improved flow of highly viscous liquids, and for uses in applications such as brake hoses.