Polyetherimide (PEI)[3]
Overview
Polyetherimide (PEI) is an amorphous, high-performance thermoplastic developed by General Electric in the 1980s under the trade name Ultem. It combines the thermal stability of polyimides with the melt processability of thermoplastics, making it suitable for demanding engineering applications. PEI is synthesized through a polycondensation reaction between bisphenol A dianhydride and m-phenylenediamine. As a premium engineering plastic, PEI is valued for its ability to retain mechanical properties at elevated temperatures, inherent flame resistance (UL94 V-0 rating), and transparency in thin sections. It is often used as a metal replacement in weight-sensitive industries like aerospace and automotive.
Physical and Chemical Properties
PEI exhibits a glass transition temperature (Tg) of 217°C, enabling continuous use up to 170°C without significant property degradation. Its tensile strength ranges from 105–110 MPa, with a flexural modulus of 3.0–3.3 GPa, outperforming many engineering plastics like PC and PSU. Chemically, PEI resists hydrocarbons, alcohols, and dilute acids but may swell in ketones or chlorinated solvents. It has a dielectric strength of 830 V/mil and a low dissipation factor (0.0013 at 1 kHz), making it ideal for electrical applications. The material meets FDA and EU food contact compliance in specific grades.
Main Applications
In aerospace, PEI is used for cabin interior components (e.g., seat frames, ducting) due to its flame-smoke-toxicity (FST) compliance. The automotive industry utilizes it for under-hood sensors, headlight reflectors, and transmission components where heat resistance is critical. The electronics sector employs PEI in PCB insulators, connector housings, and 5G antenna components for its stable dielectric properties. Medical applications include surgical tools and sterilizable equipment. Emerging uses include 3D printing filaments for high-temperature prototypes.
Safety and Storage
PEI pellets are generally stable at room temperature but should be dried (4–6 hours at 150°C) before processing to prevent hydrolysis. Process temperatures typically range from 340–425°C for injection molding, with adequate ventilation required to manage minor fumes. Long-term storage should avoid humid environments to prevent moisture absorption (>0.1% can cause processing defects). Spills pose minimal environmental risk but should be collected using non-sparking tools. Disposal via incineration should follow local regulations due to potential hydrogen cyanide emissions at very high temperatures.
B2B Procurement Guide
When sourcing PEI, specify requirements such as: 1. Grade: Standard (e.g., 1000 series), glass-filled (e.g., 2300 with 30% glass), or specialty (ESD-safe, optically clear) 2. Certifications: UL file number, FDA/EU compliance if needed 3. Form: Pellets (most common), powder, or pre-compounded masterbatches Lead times for custom formulations may extend to 8–12 weeks. Bulk orders (pallet quantities) typically reduce costs by 15–20%. Major suppliers include SABIC (Ultem), RTP Company, and Ensinger. Always request technical datasheets with property tables for your specific application.
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