Polyvinyl Chloride - Flexible

Symbol: PVC-F
Crystallinity: Amorphous
Trade Names: Geon, Apex, Colorite, Polyvin


PVC-F flexible pipe Fotolia_1120980_M.jpgFlexible PVC is more commonly extruded than injection molded to produce weatherstripping, tubing and other products. However handles, seats and accessories are molded due to PVC’s resistance to weathering, chemicals and impact. It is also inherently flame retardant.

Processing Considerations:

  • Residence Time: Residence time is typically 2 to 4 minutes.
  • Back Pressure: Back pressure runs 100 PSI (1000 plastic pressure) or less.
  • Drying: PVC-F resin is hygroscopic and may or may not have to be dried. Drying helps surface finish and splay.
  • RPM: RPM runs 100 or less.

Screw Design Based on:

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

Other Information:

  • Mixer: A low shear mixing element, like Reiloy Westland Corporation’s Eagle, can help melt quality.
  • Barrier: Barrier screws are not recommended when processing PVC-F.
  • Custom Design: A general purpose design screw will run this resin however, depending upon residence time, a screw specifically designed for PVC-F may be recommended for optimum processing results.
  • Recommended Valve: A smear tip or 3 piece free flow is recommended.
  • Screw & Barrel Material Recommendation: Creates corrosive environment resulting from HCL acid in the resin. Stainless steel or chrome plate for the screw and a premium bimetallic barrel is recommended.

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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Industry Applications - Resins

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