Overview
Polyetherimide (PEI), commercially known as Ultem, is an amorphous high-performance thermoplastic developed in the 1980s. It combines the rigidity of polyimides with the processability of thermoplastics, making it ideal for precision-engineered components. PEI is synthesized via a polycondensation reaction between bisphenol A dianhydride and m-phenylenediamine. Its unique molecular structure provides exceptional thermal stability (continuous use up to 170°C) and inherent flame retardancy without halogen additives. The material is FDA-compliant for food contact and USP Class VI-certified for medical applications, expanding its usability across regulated industries.
Physical and Chemical Properties
PEI exhibits a glass transition temperature (Tg) of 217°C and can withstand short-term exposure to 200°C without significant degradation. Its tensile strength (110 MPa) and flexural modulus (3.3 GPa) surpass most engineering plastics like PC or ABS. The material maintains dimensional stability even in humid environments (0.7% water absorption at saturation). Chemically, PEI resists hydrolysis, weak acids, and hydrocarbons but is attacked by strong bases and polar solvents. Its dielectric constant (3.15 at 1 MHz) and volume resistivity (1017 Ω·cm) make it valuable for electrical applications. The material achieves UL94 V-0 flame rating at thicknesses as low as 0.41 mm.
Main Applications
In aerospace, PEI replaces metal in cabin interior components like seat frames and ducting due to its 40% weight savings and FAA flammability compliance. Automotive applications include under-hood sensors and transmission components where thermal stability is critical. The electronics industry utilizes PEI for SMT insulators and connector housings, leveraging its CTE matching with copper. Medical-grade PEI appears in sterilizable surgical tools and MRI-compatible devices. Recent innovations include 3D printing filaments for high-temperature functional prototypes, with modified PEI grades offering improved layer adhesion.
Safety and Storage
PEI pellets require storage below 30°C with relative humidity under 50% to prevent moisture absorption (max 0.25% before processing). Bulk containers should be resealed after use to minimize exposure to atmospheric moisture, which can cause processing defects. When machining PEI, local exhaust ventilation is recommended to capture fine particulates. Molten PEI processing (300-400°C) demands thermal gloves and face shields due to potential splatter hazards. Spills should be collected using non-sparking tools and disposed of as non-hazardous waste in compliance with local regulations.
B2B Procurement Guide
Industrial buyers should specify requirements by ISO 10993-1 (medical), FAA 25.853 (aerospace), or UL 94 (electrical) standards as applicable. Key procurement considerations include: 1. Verify melt flow index (MFI) ranges: 5-25 g/10min (ASTM D1238) for injection molding vs. extrusion grades 2. Request batch-specific property datasheets, especially for glass-filled (10-30% GF) or mineral-reinforced variants 3. Evaluate supplier capabilities for custom compounding with additives like carbon fiber or internal lubricants 4. For large orders (5+ metric tons), negotiate pricing tiers and confirm lead times (typically 4-8 weeks for specialty grades)
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