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Brittleness

Suggested Corrective Actions

Machine

  • If worse, decrease injection speed or increase gate size or number.
  • Move mold to machine with smaller cylinder.
  • Reduce material melt temperature by lowering barrel settings, reducing screw back pressure, or reducing screw speed.

Material

  • Check for material contamination, non-uniform regrind, excessive fines.
  • Check part relative viscosity.
  • Check resin moisture content.
  • Decrease amount of regrind.
  • If resin is too dry, reduce drying time or temperature, lower stock temperature or pressures.
  • If resin is too wet, dry material before use.
  • Moisturize parts before shipping or use.
  • Use higher impact grade of material.

Mold

  • Increase radii of fillets and corners.
  • Lower mold temperature.