Acrylonitrile Styrene Acrylate

Symbol: ASA
Crystallinity: Amorphous
Trade Names: Centrex, Geloy, Terblend, Luran

Learn More about ASA.


ASA is an amorphous terpolymer produced either by a patented process or by grafting an acrylic elastomer to a copolymer SAN. It is very weatherable with many of the physical properties of PBT. Tough and stable, plus resistant to aging and yellowing, it is often used for outside building applications, plus recreation and automotive products.

Processing Considerations:

  • Residence Time: Residence time runs between 2 to 5 minutes.
  • Back Pressure: Back pressure is typically 150 PSI (1500 plastic pressure) or less.
  • Drying: Drying is necessary at a temperature between 175°F and 230°F with a drying time of 2 to 4 hours.
  • RPM: Recommended 50 to 100 RPM.

Screw Design Based on:

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

Other Information:

  • Mixer: A low shear mixing screw, such as the Reiloy Westland Corporation Eagle mixer, can be utilized when needed.
  • Barrier: A barrier screw is not recommended.
  • Custom Design: A custom screw designed for ASA will produce better results than a general purpose designed screw.
  • Recommended Valve: The recommended valve to use when processing ASA is a 3-piece free flow.
  • Screw & Barrel Material Recommendation: The screw and barrel used to process ASA can be manufactured from standard alloys.
  • Similar to Resin: ASA processes similarly to PMMA (Poly[methyl methacrylate]), or SAN (Styrene Acrylonitrile).

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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