Materials

PEI (Polyetherimid)

PEI is an amorphous, high temperature material with relatively low cost compared to other high temperature materials. It has excellent elongation and impact strength, and can be molded to tight tolerances. Its chemical resistance is not as good as crystalline materials but is excellent for an amorphous material. PEI behaves similar to polycarbonate but can perform at higher temperatures.

Ultem

Typical Properties

Tensile Strength14,000-28,000 psi
Flexural Modulus480,000-1,300,000 psi
Impact Strength2 ft-lb/in notched izod
Max Temperature375°-420° F
Chemical ResistanceFair to Good

Applications

  • Commercial aircraft interiors
  • Healthcare products
  • Cooking utensils
  • Fiber optics
  • Electrical and electronic applications

Advantages

  • + High heat resistance
  • + Exceptional strength and impact modulus
  • + High dielectric strength
  • + Broad chemical resistance
  • + Biocompatible
  • + Excellent machinability and finishing characteristic
  • + Outstanding processability on conventional molding equipment
  • + Flame resistance with low smoke evolution

Disadvantages

  • − Translucent — opaque-clear is not available
  • − High cost
  • − Notch sensitive
  • − High processing temps required
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