1, PEI has good flame retardancy and low smoke, and its combustion rating is UL94-V-0.
2, PEI has a strong high temperature stability. High temperature resistance, thermal deformation temperature of 220 ° C, can be used for a long time at -160 to 180 ° C operating temperature. 3, hydrolytic stability is very good, high temperature resistance, steam resistance; 4. Polyetherimide has good UV and Y-ray resistance.