Poly(1,4-phenylene ether-ether-sulfone) is widely used in high-performance applications due to its excellent thermal stability, chemical resistance, and mechanical properties. It is commonly employed in the manufacturing of membranes for water purification and gas separation, where its durability and efficiency in harsh environments are critical. In the aerospace and automotive industries, it is utilized for lightweight, heat-resistant components that can withstand extreme conditions. Additionally, it serves as a material for electrical insulation in electronics, offering reliability under high temperatures and exposure to chemicals. Its biocompatibility also makes it suitable for certain medical devices and implants.