PEI – the flexible and temperature-resistant plastic
Polyetherimide is a polycondensation product consisting of m-phenylenediamine, phthalic anhydride and bisphenol A. PEI is only slightly UV-resistant. Its outstanding properties are rather its high elasticity with good viscosity and creep rupture strength. With a flexural modulus of approximately 3000 MPa at room temperature, unfilled PEI ranks among the best construction materials. At the same time, it is outstandingly resistant to stress cracking and non-flammable by nature. The temperature application range of PEI is between -50 to 170°C. According to UL94 V-0 it is self-extinguishing. If this plastic is burned, it does not produce any toxic gases. Many types of this plastic comply with the FDA guidelines.
Polyetherimide is resistant to chemicals
On top of all of that, this high-performance plastic is highly hydrolysis-resistant and dimensionally stable. Compared to polyamide, its moisture absorption is low. It also shows good resistance to many chemicals, for example fully halogenated hydrocarbons, alcohol and aqueous solutions. It has good heat sealability characteristics with itself and many other materials. Its metal adhesion capacity with copper, for example by sputtering, is high. The electrical properties of polyetherimide, such as resistance, are constantly at a good level across a wide temperature range.