Ultem® (PEI – Polyetherimide)
Ultem® PEI (polyetherimide) is an amorphous, high-strength thermoplastic known for its excellent heat resistance, dimensional stability, and flame resistance. It maintains mechanical properties at elevated temperatures while offering good electrical insulation and chemical resistance, making it suitable for demanding structural and electrical applications.
Ultem® components are commonly produced through extrusion, injection molding, and machining, with glass-reinforced grades available to increase stiffness and load-bearing capability.
Key Performance Characteristics
High strength and rigidity at elevated temperatures
Excellent dimensional stability
Inherent flame resistance and low smoke generation
Good electrical insulation properties
Resistance to a wide range of chemicals
Typical Components Made with Ultem®
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Electrical Insulators & Connectors
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Structural Brackets & Housings
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Instrument Trays & Panels
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Precision Machined Components
Available Ultem® Formulations
Roncelli offers the following Ultem® formulations, including:
Unfilled PEI
Glass-filled Ultem® for increased stiffness
Industry Applications & Why Ultem® Works
Aerospace & Defense
Aerospace platforms require materials that combine strength, flame resistance, and dimensional stability.
Ultem® is used in aircraft interiors, electrical housings, and structural components where lightweight performance and thermal resistance support system reliability.
Space Systems
Space hardware benefits from materials that perform consistently across extreme temperature ranges.
Ultem® supports housings, brackets, and insulating components where stability and low mass are critical to spacecraft design.
Semiconductor Capital Equipment
Semiconductor tools require materials that tolerate heat and repeated process cycles.
Ultem® is used in enclosures, fixtures, and structural parts where dimensional control and cleanliness are essential.
Medical & Life Sciences
Medical manufacturing environments demand materials that balance strength, cleanliness, and regulatory compliance.
Ultem® is commonly used in medical device housings, trays, connectors, and instrumentation components requiring high heat resistance and dimensional stability. Its repeated sterilization capability and inherent flame resistance make it suitable for reusable medical and laboratory applications.
Downloads — Technical Resources
Download detailed PDF datasheets for each Ultem® formulation:
DO NOT DELETE
Common Formulations
Ultem® 1000 – Unfilled, High Strength and Toughness, Dielectric Strength
Ultem® 2300 – 30% Glass Filled, Improved Strength and Rigidity
Semitron Esd® 410C – Electrically Conductive
Semitron® Esd 420 – Electro Static Dissipative
Semitron® Esd 420V – Electro Static Dissipative with Improved Strength and Stiffness
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