PEI

material

Polyetherimide (PEI) is a high-performance amorphous thermoplastic offering exceptional heat resistance, flame retardancy, and dimensional stability for demanding applications.

In Simple Terms

PEI is a premium engineering plastic known for its ability to withstand extreme temperatures and maintain properties in harsh environments. It combines the ease of processing of thermoplastics with performance characteristics approaching those of thermosets.

Why It Matters

PEI enables manufacturers to replace metal components and thermosets in critical applications while maintaining processability. Its inherent flame retardancy eliminates the need for additives, making it ideal for aerospace and electronics where weight and safety are paramount.

Technical Details

PEI exhibits a glass transition temperature around 217°C, continuous use temperature up to 170°C, and inherent UL 94 V-0 flame rating without additives. It maintains excellent dimensional stability, low creep, and chemical resistance while being processable via injection molding, extrusion, and thermoforming at melt temperatures of 340-400°C.

Real-World Examples

Aerospace interior components

PEI's inherent flame retardancy and low smoke generation make it ideal for aircraft cabin components, meeting strict FAR 25.853 requirements without flame retardant additives

Medical device sterilization trays

PEI withstands repeated steam sterilization cycles at 134°C while maintaining dimensional stability and transparency for surgical instrument trays

High-temperature electrical connectors

PEI's combination of electrical insulation properties and 170°C continuous use temperature makes it suitable for automotive under-hood connectors and industrial electrical components