PEI – Polyetherimide Applications
Polyetherimide (abbreviate PEI) is an amorphous, amber-to-transparent thermoplastic polyimide with characteristics similar to the related plastic PEEK. Relative to PEEK, PEI is cheaper, but less temperature-resistant and lower in impact strength. PEI has a high dielectric strength, natural flame resistance, and extremely low smoke generation. PEI has excellent mechanical properties and performs in continuous use to 340°F (170°C).
Benefits & Liabilities of PEI
Benefits
- Continuous use temperature to 180 Deg. C
- Inherent flame retardancy
- Excellent dimensional stability
- Excellent mechanical properties at elevated temperatures
- Good UV resistance
- Transparent to visible, infrared and microwave radiation
- FDA compliant
Liabilities
- Very High cost
- Not suitable for use with chlorinated solvents
- Must be dried before processing
- Low colorability
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