Polyamide-imide

Symbol: PAI
Crystallinity: Amorphous
Trade Names: Torlon

Description:

image001_S.jpgPAI is an amorphous, high temperature, engineering resin. It has superior mechanical properties up to 500°F with good dimensional stability, impact and chemical resistance. It is very viscous and hydraulic accumulators are often used for fast fill. Two grades are available, Standard and #2000 all by Amoco. They have quite different screw designs and processing parameters.

Processing Considerations:

  • Residence Time: Residence time is between 2 and 4 minutes. Excessive residence time increases the resistance to flow (viscosity). Parts are post-cured to achieve properties.
  • Back Pressure: Use low back pressure.
  • Drying: PAI material must be dried.
  • RPM: RPM will run 30 or greater.

Screw Design Based on:

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

Other Information:

  • Mixer: A low shear mixer, like Reiloy Westland Corporation’s Eagle mixer, can be used in processing PAI.
  • Barrier: A barrier screw is not recommended when processing PAI.
  • Custom Design: A custom screw designed to process PAI will produce better results than a general purpose screw.
  • Recommended Valve: It is recommended to have a flighted smear tip incorporated onto the screw.
  • Screw & Barrel Material Recommendation: The screw and barrel processing PAI should be manufactured from special alloys.

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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