Overview
PEI (Polyetherimide) powder is a high-performance thermoplastic widely used in laboratory and industrial settings due to its exceptional thermal and mechanical properties. Developed as an advanced engineering plastic, PEI powder is valued for its ability to withstand extreme temperatures and harsh chemical environments. Its amorphous structure contributes to dimensional stability, making it suitable for precision applications. The powder form is particularly favored for additive manufacturing (e.g., selective laser sintering) and composite material production, where uniform particle size and purity are critical.
Physical and Chemical Properties
PEI powder exhibits a glass transition temperature (Tg) of approximately 217°C and can operate continuously at temperatures up to 170°C without significant degradation. Its inherent flame resistance (UL94 V-0 rating) and low smoke emission make it ideal for aerospace and transportation applications. The material demonstrates excellent resistance to hydrocarbons, alcohols, and weak acids but may degrade in strong bases or concentrated sulfuric acid. Its dielectric constant (3.15 at 1 MHz) and low dissipation factor are advantageous for electronic components.
Main Applications
In aerospace, PEI powder is used for lightweight structural components and cabin interiors due to its flame-smoke-toxicity (FST) compliance. The electronics industry utilizes it for connectors and insulating parts, leveraging its stable dielectric properties. Medical applications include sterilization-compatible devices and surgical tools. Recent advancements in 3D printing have expanded its use for prototyping and functional end-use parts, where high temperature resistance is required. PEI powder is also compounded with carbon fibers or nanoparticles to enhance specific properties for specialized applications.
Safety and Storage
While PEI powder is not classified as hazardous, precautions should be taken to minimize dust inhalation. Processing above 380°C may release trace volatile compounds, requiring adequate ventilation or fume extraction systems. Long-term storage recommendations include moisture-proof containers at temperatures below 30°C. The material is hygroscopic and should be dried (120-150°C for 4 hours) before high-temperature processing to prevent hydrolysis-induced molecular weight reduction.
B2B Procurement Guide
When sourcing PEI powder, prioritize suppliers who provide batch-specific certificates of analysis (CoA) detailing melt flow index, ash content, and residual solvent levels. Particle size distribution (typically 20-100 microns for SLS) should match your processing method. For cost-sensitive projects, consider recycled or regrind PEI (30-50% lower cost) where properties allow. Establish supplier relationships with manufacturers who offer technical support for material selection and processing parameter optimization, particularly for emerging applications like high-frequency circuit substrates.
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