DESCRIPTION

Teflon™ FEP Resin Products Offer Flexibility

Designed to enhance coatings, melt extrusions, and impregnation, Teflon™ FEP (fluorinated ethylene propylene) resins come in pellet form. They also work with conventional melt-extrusion techniques and injection-, compression-, transfer-, and blow-molding processes.

Processing

A high melt strength and drawdown capacity facilitates the use of large dies and drawdown tooling to increase production rates. Using larger length-over-diameter extruder barrels provides enough residence time at high production rates to melt these high-temperature polymers. Reciprocating screw injection-molding machines are most effective. It's recommended that manufacturers use corrosion-resistant metals for any equipment that may contact molten resin.

The properties of Teflon™ products make it the preferred solution for a host of industrial applications and processing techniques. As industrial manufacturing continues to thrive, the ongoing development of Teflon™ fluoropolymers strengthen and reinforce the industry by:
* Increasing uptime

* Facilitating innovation

Features and Benefits of Teflon™ FEP Resins

Typical Application:Tubes, piping, linings, bellows, valves and other components for the chemical industry. Jackets for Wire and Cable applications demanding a high degree of stress crack resistance.

DuPont Teflon FEP 9302 is a melt-processible copolymer of tetrafluoroethylene and hexafluoropropylene without additives that meets the requirements of ASTM D 2116 type IV.

It offers the excellent combination of properties characteristic of Teflon ® fluoropolymer resins: non-ageing characteristics, chemical inertness, exceptional dielectric properties, low flammability, heat resistance, toughness and flexibility, low coefficient of friction, non-stick characteristics, negligible moisture absorption and excellent weather resistance.

Teflon ® FEP 9302 is used in the chemical industry for applications such as chemical linings, bellows, valve components, pipes and tubing. In demanding Wire and Cable applications, requiring a very high degree of stress crack resistance, it can be used as a material for jacketing.

Thanks to its combination of viscosity and stress crack resistance, it can be processed at faster rates and higher extrusion line speeds than many FEP grades with comparable stress crack resistance performance.

Stress crack resistance is an important element in establishing end-use performance. Experience shows that the MIT folding endurance or flex life test, performed on a thin film of resin, has established a good correlation with extensive cable testing. The higher the MIT flex life, the higher the stress-crack resistance of the resin. MIT test results should be viewed as a guide to comparative performance of the various grades of resin. We recommend that for applications involving repeated thermal and flex cycling, specific tests on the final cable always should be undertaken. See also DuPont's bulletin "Grade selector for Wire and Cable applications."

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