Energy and battery systems benefit from PEI because components often need to manage heat and electrical isolation while maintaining structural integrity. Its excellent electrical insulation, flame resistance, dimensional stability, and high-temperature performance make it suitable for battery insulators, connectors, cell-support components, electrical housings, and power-system components. PEI can help provide reliable separation and protection of electrical components in demanding thermal environments.

In aerospace and aviation, PEI is used because it combines low weight with high strength, heat resistance, and inherent flame resistance. Its low smoke generation and good dimensional stability make it particularly valuable for aircraft interiors and electrical systems, where fire safety and weight reduction are critical. Typical applications include seat components, interior panels, brackets, electrical connectors, insulators, and other cabin components.

Telecommunications equipment relies on PEI, where consistent electrical performance and precise component dimensions are required. Its excellent electrical insulation, dimensional stability, heat resistance, and mechanical strength make it suitable for connectors, insulators, antenna components, equipment housings, and communication hardware. PEI also maintains these properties across demanding operating conditions, helping improve the long-term reliability of telecommunications systems.

For medical and healthcare applications, PEI provides the durability and thermal stability needed for equipment that undergoes frequent cleaning and sterilisation. Suitable grades can tolerate repeated steam sterilisation while maintaining their strength and dimensional accuracy. This makes PEI particularly useful for surgical instrument components, sterilisation trays, medical device housings, handles, fixtures, and diagnostic equipment, where long service life and reliable performance are important.