Overview
Polyetherimide (PEI) sheet, commercially known as Ultem, is an advanced engineering thermoplastic renowned for its high-performance characteristics. Developed in the 1980s, PEI combines the rigidity of polyimides with the processability of thermoplastics, making it a preferred material for demanding industrial applications. PEI sheets are manufactured through extrusion or compression molding processes, resulting in uniform thickness and consistent mechanical properties. The material's amber hue and transparency (in thin gauges) distinguish it from other high-temperature plastics, while its inherent flame retardancy eliminates the need for additives.
Physical and Chemical Properties
PEI exhibits exceptional thermal stability with a continuous service temperature of 170°C and short-term resistance up to 200°C. Its glass transition temperature (Tg) of 217°C ensures dimensional stability under heat stress, outperforming many engineering plastics like PEEK and polycarbonate. The material demonstrates outstanding mechanical properties, including a tensile strength of 110 MPa and flexural modulus of 3.3 GPa. Chemically, PEI resists hydrolysis, weak acids, and hydrocarbons but may degrade in strong alkaline solutions or polar solvents. Its UL 94 V-0 flammability rating (1.5mm thickness) makes it suitable for fire-safe applications without halogenated additives.
Main Applications
In aerospace, PEI sheets serve as lightweight replacements for metal in cabin interiors, ducting, and structural components, benefiting from FAA approval for aircraft use. The automotive industry utilizes PEI for under-hood sensors, transmission components, and electrical connectors where high temperature resistance is critical. Electronics manufacturers value PEI for circuit boards, chip carriers, and insulating films due to its dielectric properties (Dk=3.15) and low outgassing. Medical applications include sterilizable surgical instruments and MRI components, leveraging PEI's biocompatibility and radiation resistance. Emerging uses include 3D printing filaments for high-temperature functional prototypes.
Safety and Storage
PEI presents low toxicity risks under normal handling conditions, earning FDA compliance for food contact applications. However, machining operations generate fine dust requiring NIOSH-approved respirators (N95 or better) and adequate ventilation to prevent respiratory irritation. Sheets should be stored horizontally on flat racks to prevent warping, ideally at 15-30°C with <60% relative humidity. Prolonged UV exposure may cause slight surface discoloration, though mechanical properties remain unaffected. For fire safety, PEI self-extinguishes but may emit phenolic smoke when burned—install smoke detectors in processing areas.
B2B Procurement Guide
When sourcing PEI sheets, specify thickness tolerance (typically ±10%), surface finish (molded, machined, or polished), and color requirements. Industrial-grade sheets commonly range from 0.5mm to 50mm thickness, with custom sizes available from specialty manufacturers. Verify material certifications including ISO 10993-1 for medical applications or MIL-P-46183 for military use. Lead times vary from stock availability (1-2 weeks) to custom production (8-12 weeks). For cost-sensitive projects, consider regrind material options which maintain 90% of virgin PEI properties at 20-30% lower cost. Always request batch-specific test reports for critical applications.
Related Manufacturers
- 主营：电木板、pom板材、优力胶、密封圈