PPSU

PPSU stands for polyphenylsulfone, an amorphous, high-temperature thermoplastic in the polyaryl sulfone family. It is a heat‑resistant, chemically robust polymer formed by condensation polymerization of difluorodiphenylsulfone derivatives with dihydroxy compounds, yielding a sturdy, aromatic backbone.

Key properties of PPSU include very high thermal stability and mechanical performance at elevated temperatures. The glass transition temperature is typically in the range of about 210 to 230°C, and the polymer can sustain continuous service temperatures around 180 to 200°C with good dimensional stability. PPSU also offers excellent toughness, impact resistance, and creep resistance at elevated temperatures, along with strong chemical resistance to many acids, bases, and solvents. It is generally transparent or translucent and exhibits good hydrolytic stability, which supports sterilization and repeated use in medical and pharmaceutical applications.

Processing and fabrication of PPSU are achieved through standard melt-processed techniques. It can be melt extruded, injection molded, extruded, blow-molded, or formed by other high-temperature fabrication methods. Typical processing temperatures are in the upper melt range, roughly 360 to 420°C, requiring equipment designed for high‑temperature thermoplastics. PPSU can also be processed into films, sheets, and fittings, and is compatible with some additive manufacturing approaches.

Common applications for PPSU include medical devices and sterilizable components (such as housings, connectors, and tubing components), pharmaceutical equipment, and other high-temperature, chemically demanding parts. It is also used in aerospace, automotive, and consumer electronics where long-term heat resistance is valuable. Recycling and disposal follow standard practices for high-temperature engineering plastics, with emphasis on mechanical recycling and energy-intensive processing routes.

See also: polysulfones, PSU, PES, PEEK.