Cellulose Acetate Propionate

Symbol: CAP
Crystallinity: Crystalline*
Trade Names: Tenite


CAP Toothb Fotolia_33946131_S.jpgCellulosics are developed by combining cellulose with esters, which produces a hard, scratch resistant part that is capable of intense color. CAB and CAP are tougher than CA but all are chemically resistant, electrically insulating and sound absorbing. NOTE: Although crystalline materials, all process like amorphous materials. All are heat sensitive.

Processing Considerations:

  • Residence Time: Residence time ranges between 2 to 4 minutes.
  • Back Pressure: Back pressure is typically 150 PSI (1500 plastic pressure) or less.
  • Drying: All material must be dried, typically between 150°F and 185°F for 2 – 3 hours..
  • RPM: Typically ranges from 30 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 can be used to run CAP. Reiloy Westland Corporation’s Eagle mixer has been proven to successfully process this resin.
  • Barrier: Barrier designed screws are not recommended.
  • Custom Design: A screw custom designed to process CAP is recommended over a general purpose design.
  • Recommended Valve: The recommended valve is a 3-piece free flow.
  • Screw & Barrel Material Recommendation: CAP materials develop gasses which produce acetic, butyric and propionic acids. Corrosion is a problem and special alloys should be used in manufacturing screws and barrels to process CAP.
  • Similar to Resin: CAP processes similar to CA (Cellulose Acetate), CAB (Cellulose Acetate Butyrate) & COC (Cyclic Olefin Copolymers).

*Materials are very viscous which means they are highly resistant to flow.

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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