Polyetherimide[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 processability of thermoplastics, making it ideal for demanding engineering applications. PEI is synthesized through a condensation reaction of bisphenol A dianhydride and m-phenylenediamine. As a raw material, PEI is supplied as pellets, powder, or solutions for further processing. Its unique molecular structure provides inherent flame resistance without halogen additives, meeting stringent aerospace and transportation safety standards. The material is FDA-compliant for food contact and medical applications.
Physical and Chemical Properties
PEI exhibits a glass transition temperature (Tg) of 217°C, retaining mechanical properties up to 170°C in continuous service. Its tensile strength (110 MPa) and flexural modulus (3.3 GPa) surpass most engineering plastics like PC and ABS. The material maintains stable dielectric properties across a wide frequency range (1kHz-1GHz), with a dielectric constant of 3.15. Chemically, PEI resists hydrolysis, weak acids, and hydrocarbons but is attacked by strong bases and polar solvents. Its UL94 V-0 flame rating (0.8mm thickness) and low smoke density (<5% of PVC) make it preferred for enclosed spaces. UV-stabilized grades are available for outdoor use with minimal property degradation over 10+ years.
Main Applications
In aerospace, PEI replaces metal in cabin interior panels, ducting, and tray tables due to its 40% weight savings and FST (fire-smoke-toxicity) compliance. The automotive industry uses it for throttle bodies, sensor housings, and EV battery components where high heat and chemical resistance are critical. Electronics applications include SMT process carriers, RF insulators, and LED housings leveraging PEI's dimensional stability (±0.1% shrinkage) and CTE matching to copper. Medical-grade PEI (ISO 10993 compliant) is sterilizable for surgical tools and dental devices. Recent growth in fused filament fabrication (FFF) 3D printing utilizes PEI's high HDT (200°C at 1.82MPa) for end-use functional prototypes.
Safety and Storage
PEI is classified as non-hazardous under OSHA standards but generates respirable dust during machining. NIOSH-approved N95 masks and local exhaust ventilation are recommended when milling or grinding. Thermal degradation above 300°C releases trace amounts of carbon monoxide and phenol derivatives, requiring fume extraction. Storage requires double-sealed moisture barrier bags with desiccant to prevent hydrolysis. Pellets should be dried at 150°C for 4 hours before processing if ambient humidity exceeds 50%. Shelf life is typically 2 years in original packaging at <30°C. Recycled PEI retains 90% of properties after 5 reprocessing cycles, supporting sustainability initiatives.
B2B Procurement Guide
Industrial buyers should specify: 1. Grade: Standard (1000 series), high-flow (2000 series), or reinforced (e.g., 30% glass-filled 2300) 2. Certifications: UL file number, FDA 21 CFR 177.2440, or REACH compliance 3. Form: Pellets (2-4mm), fine powder (<100μm), or pre-compounded masterbatches Bulk orders (20+ metric tons) typically secure 10-15% discounts. Lead times range from 4 weeks (standard grades) to 12 weeks (custom formulations). For prototyping, consider distributors stocking small-quantity PEI filaments (1.75/2.85mm diameter) with bed adhesion promoters. Quality verification should include melt flow index (MFI) testing (6-9 g/10min at 337°C/6.7kg).
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