Ethylene Tetrafluoroethylene / Perfluoroalkoxy

Symbol: ETFE or PFA
Crystallinity: Crystalline*
Trade Names: Tefzel, Teflon

Learn More about ETFE or PFA.

Description:

ETFE Pipe Fittings Fotolia_22261125_S.jpgETFE is a fluorocarbon copolymer marketed in the U.S. by DuPont under the name TEFZEL. It is tough with high impact strength and good mechanical properties to 302°F. Its other properties approach those of Teflon. Like FEP and PFA, Tefzel is very corrosive and quite viscous. All fluoropolymers are essentially flame retardant.

Processing Considerations:

  • Residence Time: Residence time is typically 2 to 4 minutes.
  • Back Pressure: Back pressure runs 150 PSI (1500 plastic pressure) or less.
  • Drying: ETFE or PFA may need to be dried. If required, dry at 250°F for 2 hours.
  • RPM: RPM runs between 30 – 100.

Screw Design Based on:

  • Medium Compression Ratio
  • Medium Transition Length
  • Medium Meter Channel Depth

Other Information:

  • Mixer: When required, the mixer must be a low shear mixer like Reiloy Westland Corporation’s Eagle.
  • Barrier: Barrier screws are not recommended for processing ETFE or PFA.
  • Custom Design: A screw specifically designed for ETFE is recommended for optimum processing results.
  • Recommended Valve: A smear tip or 3 piece free flow depending upon the viscosity of the resin.
  • Screw & Barrel Material Recommendation: Highly corrosive requiring only special alloys for manufacturing of screws and barrels. If corroding, dark color or black specks occur.

*Material is very viscous and requires slow injection to avoid melt fracture (cloudy or frosty).

Various additives and/or fillers can have an effect on a resin’s process behavior. For more detailed information, please contact Reiloy Westland Corporation.

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