FEP (fluorinated ethylene propylene) is an excellent alternative to PTFE and is melt-processable making it easier to extrude long continuous lengths. Its low gas permeability and non-stick properties, high dielectric strength, excellent UV transmission rating and inert characteristics make it an ideal choice for a wide variety of applications. It is a very tough polymer that can be heat-formed, tipped, tapered, flared and flanged. It is available in a range of sizes from rods up to 6" diameter to sheets as thick as 2".

Unlike many other plastic materials, FEP is not chemically reactive and is resistant to almost all chemicals except for molten alkali metals, elemental fluorine and fluorine precursors at elevated temperatures. Its inert characteristics also make it well suited for laboratory applications where leakproof Nalgene bottles and centrifuge tubes are preferred over glass. It can also be used for coating surgical instruments and jacketing guidewires. FEP shrinks at 212degF (100degC), much lower than PTFE's minimum of 617degF (325degC).

FEP is also commonly used for UV cured resin 3D printing because it is optically transparent and allows over 97% of UV light to pass through it. It is also a very useful material for making sample holders in microscopy because of its transparency and low coefficient of friction. It is sterilizable with all known chemical and thermal methods, including gamma radiation. Its only drawback is that it is quite expensive to produce because of the need for special molding and processing equipment and the cost of the raw materials.