Application – The PSU Polysulfone market is primarily driven by five application clusters that together shape the overall market size. Medical devices account for roughly 30 % of demand, reflecting the polymer’s biocompatibility, sterilization resilience, and transparency required for catheters, dialysis membranes, and implantable components. Aerospace & Defense contributes about 25 %, where high‑temperature stability, flame retardancy, and low out‑gassing support structural brackets, sensor housings, and cockpit interiors. The Automotive segment, representing 20 % of the market, leverages PSU’s resistance to chemicals and heat for fuel‑system parts, under‑hood connectors, and lighting modules. Electronics captures 15 % as the material’s dielectric strength and dimensional stability enable connectors, printed‑circuit‑board substrates, and semiconductor encapsulants. Finally, Water treatment holds the remaining 10 %, where PSU’s resistance to chlorine and UV exposure underpins filtration membranes and pipe liners. This distribution underlines the breadth of the PSU Polysulfone segmentation and quantifies each application’s contribution to total revenue.