Overview
Polysulfone (PSU) is an amorphous high-performance thermoplastic belonging to the sulfone polymer family. Developed in the 1960s, it combines exceptional thermal stability (continuous use up to 160°C) with inherent flame resistance and transparency. Unlike many engineering plastics, PSU maintains mechanical properties in steam and hot water environments, making it indispensable for sterilization applications. PSU is synthesized via polycondensation of bisphenol A and 4,4'-dichlorodiphenyl sulfone. Its molecular structure features aromatic rings linked by sulfone groups, contributing to rigidity and chemical inertness. The material is processed via injection molding, extrusion, or blow molding but requires higher temperatures (300-380°C) than conventional plastics.
Physical and Chemical Properties
PSU exhibits a glass transition temperature (Tg) of 185-190°C and can withstand short-term exposure to 180°C without significant deformation. Its tensile strength ranges from 70-75 MPa, with low creep even under load. The material achieves UL94 V-0 flame rating without additives and shows minimal smoke emission. Chemically, PSU resists acids, alkalis, and hydrocarbon solvents but may swell in ketones or chlorinated solvents. It withstands repeated autoclaving (134°C) and gamma/EtO sterilization. Hydrolytic stability allows prolonged use in pressurized water systems, though prolonged UV exposure requires stabilization.
Main Applications
In medical technology, PSU is used for surgical instrument handles, dialysis membranes, and sterilization trays due to biocompatibility (ISO 10993 compliant). Food contact applications include coffee machine parts and microwaveable containers (FDA/EC compliance). Automotive uses encompass under-the-hood sensors and electrical connectors, leveraging PSU's dielectric strength (>15 kV/mm). Industrial applications feature chemical process equipment, membrane supports, and aerospace ducting. Recent developments include PSU blends with ABS or PC for cost-sensitive applications.
Safety and Storage
While PSU is non-toxic in solid form, processing fumes may contain trace sulfone compounds requiring adequate ventilation. NFPA ratings classify it as health hazard 1 (slight) and flammability 1 (slight). Pellets must be stored in moisture-proof packaging (<0.05% water content) to prevent hydrolysis during processing. Prolonged exposure to humidity above 60% can cause surface crazing. Regrind material should be limited to 30% of feedstock to maintain properties.
B2B Procurement Guide
Buyers should specify: 1) ISO 13485 certification for medical grades, 2) FDA 21 CFR or EU 10/2011 compliance for food contact, 3) UL file number for electrical applications. Black-colored grades typically offer better UV resistance than natural amber. Lead times for specialty compounds (e.g., glass-filled or antistatic) may extend to 8-12 weeks. Bulk shipments (500+ kg) often qualify for 5-8% discounts. Alternatives like PES or PEI may be considered for higher temperature requirements but at 2-3x the cost.
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