(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.
| Max Temp. | Tensile Strength | Chemical Resistance | Flexural Modulus | Impact Strength |
| 375°-420° F | 14,000-28,000 psi | Fair to Good | 480,000-1,300,000 psi | 2 ft-lb/in notched izod |
Pros
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
Cons
Translucent and opaque-clear is not available
High cost
Notch sensitive
High processing temps required
PEI ULTE Resin 2100R (10% Glass fiber filled, UL94 V0)
PEI ULTEM 2200R
PEI ULTEM 2300