PEI (Polyetherimide) is a Transparent amber color high-performance thermoplastic engineering plastic, officially known as Polyetherimide. Its molecular structure combines aromatic imides and ether bonds, endowing it with excellent high temperature resistance, High rigidity, high hardness，mechanical strength, and dimensional stability.
PEI can maintain excellent creep resistance and rigidity at high temperatures, with short-term use temperatures reaching over 200 ℃. It also has flame retardancy (UL94 V-0 grade) and chemical corrosion resistance.

In addition, PEI has excellent electrical insulation performance and stable dielectric constant, and is widely used in the electronic and electrical, aerospace, medical equipment, and automotive industries.

PEI material can be reinforced with fillers (such as fiberglass, carbon fiber, PTFE, etc.) to improve mechanical properties, wear resistance, etc., meeting the needs of different enterprises.
PEI resin
Glass fiber reinforced PEI
Carbon fiber reinforce PEI
Conductive/ESD PEI
Wear resistance PEI

PEI has a high Rockwell hardness (80-85) and excellent wear resistance, which can effectively reduce tool wear during CNC machining. The surface of PEI parts after CNC machining is smooth, with fewer shrinkage marks and depression defects.
Pei has a low coefficient of thermal expansion, and the extruded Pei material is not easily subjected to dimensional changes due to temperature during processing. In addition, the shrinkage rate of Pei is low, only 0.5-0.7%, and the dimensional changes are small during cooling.
PEI resin sheet
PEI resin rod
PEI GF sheet
PEI GF rod
PEI CF sheet
PEI CF rod

The color of PEI is transparent amber, and the printed product has a good appearance. Amber PEI printed parts present a semi transparent amber luster under thin-walled or hollow structures, which is suitable for scenes where internal structures need to be observed.
PEI 3d printing filaments

PEI has a low shrinkage rate of only 0.5% -0.7% in finished products, making it suitable for the manufacturing of precision products. During the injection molding process, the size and shape of the product can be better controlled to ensure the quality and accuracy of the finished product. PEI has a melting point of 337 ° C, which is lower and easier to process compared to PEEK.

PEI injection

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