Polytetrafluoroethylene or PTFE, popularly known by its trade names as Teflon, Fluon, Algoflon, Hostaflon, is the most important fluorinated material. Due to its high-viscosity mass (melting point >327 °C) it is unable to be processed with the most common methods used with thermoplastic materials.
Polytetrafluoroethylene is available on the market as:
- Polymer powder, which is produced from the polymerisation process in suspension for a compression moulding, sintering and RAM extrusion
- Polymer powder in emulsion (for the extrusion of 'doughs')
- Dispersion for applications in coatings
- Primer or additive in other plastic materials, in order to reduce sliding friction.
- Less stiff and solid
- Operating temperature range: from -270 °C to 300 °C
- Embrittlement only at temperatures lower than -260 °C
- Universal chemical stability
- Insolubility with all solvents known at lower than 300 °C
- Resistance to atmospheric agents without stabilisation
- Excellent electric and dielectric features
- A very good anti-adhesive behaviour and sliding of all materials
- Wear-resistance is not so good, but it can be improved by adding (from 5 to 40% of volume) graphite, E-carbon, bronze, iron, MoS2 or glass fibres.
SOME FIELDS OF APPLICATION
- Seals subject to static and dynamic stresses
- Bellows, pistons and other parts of machines
- Coatings and linings
- Supports for printed circuits
- Films and others