Polyetherimide (PEI) is an amorphous high-performance polymer. It is heat and hydrolysis resistant and can withstand multiple autoclaving cycles.

Its characteristics are similar to those of polyetheretherketone (PEEK) but PEI is less temperature-resistant and has lower impact strength.

Property Measure Low Measure High
Specific gravity 0.0459 lb./in.3 (1.27 g/cc) 0.0459 lb./in.3 (1.27 g/cc)
Melting point Not Applicable Not Applicable
Glass transition temperature 410°F (210°C) 421°F (216°C)
Tensile strength at break Not Available Not Available
Elongation at break 60% 80%
Hardness durometer (Shore A) 125 125
Hardness durometer (Rockwell M) 109 112
Water absorption @ 24 hours 0.25% 0.25%
Sterilization Cold sterilization
Dry heat
Ethylene oxide (EtO)
Gamma radiation
Steam autoclaving

This material data sheet is presented for reference only. For a specific application and environment, characteristics and performance may vary. Product design and suitability for use are the sole responsibility of Microspec’s customer. Microspec strongly urges customers to consult with the material manufacturer.