Polyetherimide

Polyetherimide ( PEI ) is an amorphous, amber transparent, high-performance thermoplastic with the characteristics similar to PEEK. Relative to PEEK, it is less temperature-resistant, less expensive, and lower in impact strength. It is prone to stress cracking in chlorinated solvents. It is available under the tradename Ultem, a registered trademark of General Electric, the principle developer and manufacturer.

Glass transition temperature: 216°C

Amorphous density at 25°C: 1.27 g/cc

Repeat unit: C37H24O6N2

Molecular weight of repeat unit: 592 g/mol

Polyetherimide Repeat Unit: 2D



Polyetherimide Repeat Unit: 3D