FEP non stick coating resins (fluorinated ethylene propylene), such as Dupont FEP, are produced by co-polymerization of tetrafluoroethylene and hexafluoropropylene.
With a crystalline melting point of 554 degrees Fahrenheit, this has mechanical properties suitable from cryogenic to about 400 degrees Fahrenheit. Compared with other fluoropolymers and engineering plastics, it is softer, with lower tensile strength, wear or creep resistance.
FEP non stick coating differs from other Dupont Teflon or PTFE (polytetrafluoroethylene) resins in that it is melt-processable. Much like PFA, though with lower heat stability, the FEP has the capability of forming continuous, monolithic films. This is especially important in applications requiring permeation strength, minimal micro porosity, or improved base metal isolation. It is highly resistant to oxidation and action of chemicals including strong acids, alkali, oxidizing agents, nuclear radiation, UV rays, and ozone.
Absorption rates are comparatively lower with this than almost all others. It absorbs practically no common acids or bases at temperatures as high as 400 degrees Fahrenheit. Weight increases are generally less than 1% when exposed at elevated temperatures for long periods. Aqueous solutions are absorbed little. Moisture absorption is typically less than 0.01% at ambient temperature and pressure.
Gases and vapors, too, show low permeation rates with it than for other fluoroplastics. In general, permeation increases with temperature, pressure, and surface area contact, but decreases with increased thickness.
Mechanical properties include, but are not limited to, flexibility at low temperatures, stability at high temperatures, low coefficient of friction, dielectric strength, corrosion resistance, and non stick (release). The FEP non stick coating comes from relatively newer fluorocarbon resin products. It is especially important for designers and end-users requiring higher rates of release (non stick) performance or chemical stability.
Today, it exists in a number of arrays, for increased toughness or abrasion resistance, making it another viable choice in non stick coating technology.
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