Overview
Ultem® PEI (Polyetherimide) is a high-performance amorphous thermoplastic known for its excellent strength, rigidity and electrical properties combined with high heat resistance. It offers outstanding dimensional stability, low flammability and consistent performance in harsh chemical and high-temperature environments. Its inherent flame resistance and low smoke emission make it especially suitable for aerospace and electronic applications. PEI also maintains its transparency in thin sections, making it suitable for applications requiring visibility along with mechanical strength.
Key Features
- High heat deflection temperature (up to 170–200°C)
- Excellent dielectric strength and electrical insulation
- High stiffness and mechanical strength
- Flame retardant with low smoke emission
- Amber transparent in natural form
- Good dimensional stability under load
- Chemically resistant to acids, bases and alcohols
- Easily sterilizable (gamma, steam and ethylene oxide)
Applications
- Medical and surgical instruments (autoclavable)
- Aerospace cabin and structural components
- High-temperature electrical insulation and connectors
- Lighting and display housings
- Automotive electrical systems and switches
- Precision mechanical components for chemical processing
Weaknesses
- Brittle in impact-heavy applications
- Higher cost compared to standard engineering plastics
- Limited chemical resistance to strong solvents
