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.

Specific gravity	0.0434 lb./in.3 (1.20 g/cc)	0.0434 lb./in.3 (1.20 g/cc)
Melting point	Not Applicable	Not Applicable
Glass transition temperature	302°F (150°C)	302°F (150°C)
Tensile strength at break	10000 psi (68.9 MPa)	10000 psi (68.9 MPa)
Elongation at break	80%	150%
Hardness durometer (Rockwell M)	70	70
Hardness durometer (Rockwell R)	118	118
Water absorption @ 24 hours	0.1%	0.15%
Sterilization	Ethylene oxide (EtO) Gamma and E-beam radiation Steam autoclaving (limited)

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.