Overview
PEI (Polyetherimide) sheet is an engineering thermoplastic developed by General Electric under the trade name Ultem. It combines high heat resistance (continuous use up to 170°C) with exceptional mechanical strength and electrical insulation properties. Unlike many thermoplastics, PEI maintains dimensional stability across wide temperature ranges, making it ideal for precision components. Its inherent flame retardancy (UL94 V-0 rated) and low smoke emission qualify it for stringent aerospace and transportation applications.
Physical and Chemical Properties
PEI sheets exhibit a unique combination of properties including a glass transition temperature of 217°C and heat deflection temperature of 200°C at 1.82 MPa. The material's tensile strength ranges from 100-110 MPa, with flexural modulus of 3,300 MPa. Chemically, PEI demonstrates excellent resistance to hydrocarbons, alcohols, and acidic environments, though it may degrade in strong bases. Its dielectric constant remains stable at 3.15 across a wide frequency range, with low dissipation factor (0.0013 at 1 MHz).
Main Applications
In aerospace, PEI sheets are used for cabin interior components, ducting, and structural parts due to their FST (fire-smoke-toxicity) compliance. The electronics industry utilizes them for circuit board insulators and semiconductor handling fixtures. Medical applications include sterilizable surgical tools and imaging equipment components. Automotive uses range from under-hood sensors to headlight reflectors. Recent developments include 3D printing filaments for high-temperature functional prototypes.
Safety and Storage
PEI requires standard thermoplastic handling precautions - adequate ventilation during machining to prevent inhalation of fine particles. Though non-hazardous under normal conditions, thermal decomposition above 300°C may release trace amounts of carbon monoxide. Sheets should be stored horizontally in original packaging to prevent warping. Optimal storage conditions are below 30°C with relative humidity under 60%. UV protection is recommended for long-term outdoor storage.
B2B Procurement Guide
When sourcing PEI sheets, verify the material grade (e.g., 1000 for standard, 2300 for glass-filled). Critical specifications include thickness tolerance (±5-10% is industry standard), surface finish (molded or machined), and regulatory certifications (FDA, UL, or RoHS compliance). Lead times typically range from 2-6 weeks for standard sizes. For prototyping, consider purchasing from distributors offering waterjet or laser cutting services. Bulk orders (500+ kg) often qualify for 15-20% price reductions.
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