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Core Insights - Polyetherimide (PEI) is a high-performance thermoplastic developed by GE in 1982, known for its excellent thermal stability and mechanical properties [1][2] - PEI is widely used in various industries including aerospace, automotive, electronics, and healthcare due to its unique characteristics [2] Group 1: Characteristics of PEI - PEI is a thermoplastic engineering plastic with high-temperature resistance, mechanical performance, chemical stability, and flame retardancy [2] - The glass transition temperature of PEI is 215°C, allowing for long-term use at temperatures between 160°C and 180°C, with intermittent use up to 200°C [2] - PEI exhibits low thermal expansion, maintaining dimensional stability across a wide temperature range [2] - The limiting oxygen index of PEI is as high as 47%, indicating excellent flame retardancy [2] - PEI shows strong resistance to hydrocarbons, halogenated solvents, water, and automotive fluids, demonstrating good stability in various chemical solvents [2] Group 2: Applications of PEI - In the aerospace industry, PEI is used for manufacturing various aircraft components such as sensors and ignition system parts, benefiting from its heat resistance and low smoke emissions [2] - In the automotive sector, PEI is utilized for parts like air doors and sensors, which require high performance and stability in high-temperature environments [2] - In the electronics industry, PEI is applied in solder hole sleeves, connectors, and printed circuit boards, showcasing its excellent electrical properties and dimensional stability [2] - In healthcare, PEI is used for surgical equipment and sterilization trays due to its steam resistance and compliance with FDA regulations [2] - PEI also finds applications in packaging, sports equipment, textiles, mining, marine engineering, and home appliances, highlighting its broad potential [2] Group 3: Market and Development - Global demand for PEI is increasing, with major suppliers including SABIC and GE [2] - Future development directions for PEI include enhancing performance and reducing costs, along with research into bio-based PEI for sustainable development [2] - Innovations in PEI technology involve new copolymers with higher thermal performance and optimized foaming techniques to improve material properties [2]