Polysulfone (PPS), Polyether Ether Ketone (PEEK), Polysulfone (PSF), Polyimide (PI), Polyarylate (PAR), and Liquid Crystal Polymer (LCP) are collectively known as the "6 Major Special Engineering Plastics."PPS featuresExcellent heat resistance, with a heat deflection temperature generally exceeding 260°C, it can be used within a temperature range of 180~220°C. PPS is one of the types of engineering plastics with high heat resistance; corrosion resistance is close to that of polytetrafluoroethylene, and its chemical resistance is second only to PTFE; superior electrical properties; excellent mechanical properties; good flame retardancy.PPS Drawbacks: High price, lowest among high-temperature resistant materials, yet significantly higher than general engineering plastics; poor toughness, brittle; medium viscosity is unstable.Pure PPS is rarely used due to its brittle properties, and the applied types of PPS are mostly modified for improved performance. Specific types include 40% glass fiber reinforced PPS (R-4), inorganic filled PPS (R-8), and carbon fiber reinforced PPS (G-6), etc. The development of PPS is rapid, and it is predicted to become the sixth largest engineering material.