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PSU · PESU · PPSU

High-Performance Sulfone Polymers (PSU, PESU, PPSU)

Polysulfone (PSU), polyethersulfone (PESU) and polyphenylsulfone (PPSU) are amorphous super engineering plastics combining transparency with exceptional heat and hydrolysis resistance — the standard materials for medical devices, membranes and food-contact parts. Octud is an official distributor of BASF Ultrason® and supplies the full grade range from Korean stock, with cross-reference data against Syensqo Udel® and Radel®.

PRODUCT FAMILIES
PSU
Polysulfone
187°C
Tg (glass transition)

The best cost-to-performance balance in the sulfone family. Transparent, and widely used for water filtration housings, food-contact parts and electrical insulation components.

PESU
Polyethersulfone
225°C
Tg (glass transition)

The highest heat resistance and stiffness in the sulfone family. Suited to high-temperature filtration membranes, aircraft interiors and hot electrical components.

PPSU
Polyphenylsulfone
220°C
Tg (glass transition)

Notched impact 70 kJ/m² (ISO 179, no break) — no break under notched impact — and resistance to more than 1,000 repeated steam sterilization cycles, making it the standard for reusable medical devices.

Browse by family

PSU, PESU and PPSU differ in properties and applications. Choose a family for its grades, property data and equivalency.

Key advantages

  • Withstands repeated steam and autoclave sterilization
  • Outstanding hydrolysis resistance in hot water and steam
  • Dimensional stability maintained up to 180°C
  • Honey-toned optical transparency
  • Broad chemical resistance to detergents, oils and solvents
  • Excellent electrical insulation and dielectric behaviour
  • Inherently flame retardant — self-extinguishing

Industries & applications

Medical & Healthcare
Repeatedly sterilized surgical trays and instrument handles
Food & Kitchenware
Reusable tableware and hot-cooking components
Water Treatment
Ultrafiltration (UF) and reverse-osmosis (RO) membranes
Electrical & Electronics
Connectors, sockets and circuit breakers
Automotive
Water-pump impellers, oil components, headlamp bezels
Plumbing & Sanitary
Fittings, valves and flow meters in potable water contact
RELATED READING

Related reading

All news & insights →
New products23 October 2026

BASF extends Ultrason® into AI data-centre and e-mobility electrical & electronic parts

BASF is extending its polyarylethersulfone family Ultrason® (PSU, PESU, PPSU) into electrical and electronic parts for AI data centres, high-speed connectivity and e-mobility — fibre-optic connectors, cable jacketing, magnet-wire insulation and thermal-management parts. What was announced, and what connector and electrical-component makers in Korea should check.

Technical notes23 September 2026

PPSU vs PA baby bottles: heat, impact, sterilisation and safety margin on the datasheets

PPSU is the super-engineering plastic used in hospital instruments steam-sterilised thousands of times at 134°C and in aircraft cabin interiors. We set its datasheet against the transparent PA also used in baby bottles, on identical test methods, and explain in plain terms what the 'margin' left above boiling water is and why it matters.

New products4 September 2026

Avient launches metallic-effect pre-colored sulfone formulations for Ultrason®

Pre-colored sulfone compounds that produce gold, silver and bronze metallic finishes straight out of the mould, removing the painting step along with its weight and VOC. Developed with BASF, they bring metallic-coloured Ultrason® grades to the market.

Frequently asked questions

BASF Ultrason® S 2010 is the equivalent standard-viscosity transparent PSU injection molding grade, matching on tensile strength, HDT and other key properties. Octud supplies it from Korean stock and provides evaluation samples.

BASF Ultrason® P 3010 is the equivalent PPSU grade, delivering the same non-break notched impact toughness and resistance to over 1,000 repeated steam sterilization cycles.

All three are amorphous sulfone polymers — transparent with excellent hydrolysis resistance. PSU offers the best cost-performance balance, PESU the family's highest glass transition (Tg 225°C) and stiffness, and PPSU the greatest impact toughness and repeated steam sterilization durability.

Yes. Where a part must stay transparent but needs far greater heat, hydrolysis and chemical resistance than PC can offer, sulfone polymers are the standard replacement.

Yes. Octud is the official distributor and holds BASF Ultrason® injection and extrusion grades across the S, E and P series in Korean stock — in-stock material ships and arrives anywhere in Korea within 1–2 days; non-stock grades are quoted with lead time. Tell us the application, service temperature and quantity and we reply with quotation and TDS within 24 hours.

Yes. Octud does not run its own molding machines, but we deliver part projects together with partner molders experienced in sulfone resins. Send the drawing, quantity and requirements (food contact, sterilization, electrical insulation, etc.) — we review grade selection and processing conditions first, obtain the partner molder's quotation and quote you per molded part. If you already have a molder, we support with material, colorant and processing data only.

Yes. Octud is an official Avient Colorant Chromatics™ distributor and supplies sulfone-specific masterbatch (colour concentrate) with minimal colour shift at high processing temperatures, matched to RAL or Pantone references. Both transparent tints and opaque colours are possible on PSU, PESU and PPSU; let-down ratios are confirmed after colour-sample approval.

Not sure which grade is right?

Tell us your application and required properties and our engineering team will come back within 24 hours with TDS, pricing and evaluation samples.

We'll help you find the right grade

Ask us for a TDS, pricing or a sample.

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