Polyetherimide[2]
Overview
Polyetherimide (PEI) is an amorphous thermoplastic developed in the 1980s, combining the high-temperature stability of polyimides with the melt-processability of thermoplastics. Its unique ether and imide linkages in the polymer backbone contribute to its balanced mechanical, thermal, and electrical properties. PEI is commercially available under trade names like Ultem (Sabic) and is classified as a high-performance polymer. It fills the gap between standard engineering plastics (e.g., PC, ABS) and ultra-high-temperature materials like PEEK, offering cost-effective solutions for demanding applications.
Physical and Chemical Properties
PEI exhibits a glass transition temperature (Tg) of 217°C, with continuous use temperatures up to 170°C. Its Rockwell M hardness ranges from 85-95, surpassing most engineering plastics. The material maintains >80% of its tensile strength at 150°C and shows minimal creep under load. Chemically, PEI resists hydrolysis, weak acids, and hydrocarbons but may degrade in strong alkalis or polar solvents. Its dielectric strength (20 kV/mm) and volume resistivity (1017 Ω·cm) make it ideal for electrical applications. UV stability can be enhanced with additives for outdoor use.
Main Applications
In aerospace, PEI replaces metal in cabin interior components, ducting, and radome covers due to its lightweight and flame-smoke-toxicity (FST) compliance. Automotive uses include sensor housings, throttle bodies, and transmission components where thermal stability is critical. The electronics industry utilizes PEI for PCB connectors, chip carriers, and 5G antenna components. Medical applications include surgical tools and sterilization trays (autoclavable up to 134°C). Recent developments include glass or carbon fiber-reinforced grades for structural parts requiring higher stiffness.
Safety and Storage
PEI is generally stable under normal conditions but requires precautions during high-temperature processing (>300°C). Adequate ventilation is necessary to disperse potential decomposition products (phenols, CO). NFPA 704 rating is 1 (health), 1 (flammability), 0 (reactivity). Storage should prevent moisture absorption (>0.2% may cause processing defects). Original packaging with desiccants is recommended. Shelf life typically exceeds 24 months when stored properly. For recycling, PEI can be reground and reused with <15% property loss after 3-5 processing cycles.
B2B Procurement Guide
Key specifications to verify include: ISO 10993 compliance for medical grades, UL temperature index (typically 160-180°C), and CTI (Comparative Tracking Index) >200V for electrical uses. For aerospace, confirm compliance with Boeing BMS 8-301 or Airbus AIMS 04-03-003. Lead times vary significantly: standard grades (4 weeks), custom formulations (8-12 weeks). Minimum order quantities (MOQ) range from 25kg for specialty grades to tonnage quantities for commodity PEI. Consider third-party certifications like ISO 9001 when evaluating suppliers in China, Europe, or North America.
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