Polyetherimide (PEI) is an amorphous thermoplastic with a high temperature resistance, strength, and stiffness.
PEI absorbs moisture and can cause material degradation. Keep moisture content less than 0.02%. Suggested drying conditions are 150 C [302 F] for 4 hours in a desiccant dryer (6 hours for reinforced and blended grades).
70 C 175 C [158 F 347 F] typically 140 C
70MPa 150 MPa
As high as possible
The chemical structure of PEI consists of repeating aromatic imide and ether units, which accounts for its high temperature resistance. This structure also leads to high stiffness and modifiers are used to make the material processible. PEIs are stiff and strong even without reinforcements, and they have excellent thermal stability so they can be used in high temperature applications. They also have good flame and chemical resistance, and effective electrical insulation properties. The glass transition temperature is high (215 C [419 F]). PEI exhibits low shrinkage and highly isotropic mechanical properties.