Special engineering plastics, also called high-performance engineering plastics, refer to engineering plastics with higher comprehensive performance and long-term use temperature above 150 °C, mainly used in high-tech, military and aerospace, aviation and other industries.

Special engineering plastics mainly include polyphenylene sulfide (PPS), polysulfone (PSF), polyimide (PI), polyarylate (PAR), liquid crystal polymer (LCP), polyetheretherketone (PEEK), including Fluoropolymers, etc., there are many types of special engineering plastics, and the performance is excellent and expensive.