PSU. Polysulfone. High temperature. Sterilizable.
Polysulfone (PSU) — high-performance amorphous thermoplastic. Excellent heat resistance (170°C), hydrolysis-resistant, sterilizable. Premium medical and food-service applications.
PSU plastic
PSU: better heat (175°C vs 130°C), better hydrolysis. PC: clearer, cheaper, similar impact.
Key principles.
Amorphous
Honey-colored transparent. Density 1.24 g/cm³.
UTS 70 MPa
Stiff, strong. Glass-fiber-filled grades higher.
HDT 175°C
Service temperature 160°C continuous. Withstands repeated steam autoclave.
Excellent
Resists hot water, steam. Major advantage over PC.
All methods
Steam autoclave 135°C × 1000+ cycles. Gamma, EtO, dry heat all OK.
Premium
~$15-25/kg. High-performance plastic price tier.
FAQ
PSU: better heat (175°C vs 130°C), better hydrolysis. PC: clearer, cheaper, similar impact.
PSU: cheaper (1/4 of PEEK), easier to process. PEEK: higher temperature (260°C), better chemical, mechanical.
Medical devices (sterilizable), food service (commercial dishwashers), membranes, electronics.
Natural honey color. Transparent grade gives amber tint. Pigmented grades any color.
USP Class VI grades available. FDA listed for food contact at limited temperatures.
Higher melt temperatures (320-360°C). Drying critical (150°C × 4 h).
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