Overview
Polyetherimide (PEI), commercially known as Ultem, is an amorphous thermoplastic with exceptional high-performance properties. Custom PEI sheets and rods are engineered to meet precise industrial requirements, offering a unique combination of thermal stability (continuous use up to 170°C), mechanical strength, and electrical insulation. First developed by General Electric in the 1980s, PEI has become a material of choice for applications demanding reliability under extreme conditions. Its amber hue and transparency vary with thickness, and it can be machined using standard thermoplastic processing methods.
Physical and Chemical Properties
PEI exhibits a glass transition temperature of 217°C and maintains structural integrity up to 200°C, outperforming many engineering plastics. Its tensile strength (110 MPa) and flexural modulus (3.3 GPa) remain stable across a wide temperature range. Chemically, PEI resists hydrolysis, weak acids/bases, and hydrocarbons. However, it is susceptible to strong polar solvents like ketones. The material achieves UL94 V-0 flame rating without additives and has low smoke emission, making it ideal for enclosed spaces.
Main Applications
In aerospace, PEI replaces metal in cabin components, ducting, and antenna housings due to its lightweight and radar transparency. The medical industry utilizes autoclave-sterilizable PEI for surgical tools and imaging equipment. Electronics manufacturers value PEI for circuit boards, connector housings, and semiconductor handling fixtures. Emerging uses include 3D printing filaments (FDM) and food processing equipment where FDA compliance is required.
Safety and Storage
PEI is generally stable but requires caution during machining. High-speed cutting generates fine dust—use local exhaust ventilation and NIOSH-approved respirators. Thermal degradation above 300°C releases traces of phenols and CO. Store PEI products in original packaging at <40°C with <60% humidity. Prolonged UV exposure may cause surface crazing; for outdoor use, specify UV-stabilized grades. Shelf life exceeds 5 years when stored properly.
B2B Procurement Guide
When ordering custom PEI, provide: 1) Dimensional drawings with tolerances (±0.1mm typical), 2) Surface finish requirements (as-machined, polished, etc.), 3) Color specifications (natural amber, black, or custom colors), and 4) Compliance needs (ROHS, REACH, FDA). Lead times range from 2-6 weeks for machined parts. For large-volume orders (>500kg), negotiate bulk pricing. Always request material certification and batch testing reports. Consider regional suppliers to reduce logistics costs for heavy sheets.
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