Filament (FDM)

PPSU and PSU 3D printing

PPSU and PSU are amorphous sulfone polymers that withstand heat, hydrolysis and many chemicals. We print them in Brescia with high-temperature FDM.

Price band

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2 variantsData checked on 13 November 2026

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What it is for

PPSU and PSU are used for parts in contact with hot water and steam: manifolds, fittings, valve bodies, components of plumbing and washing systems, tools and containers that are sterilized repeatedly. They resist hydrolysis, detergents, acids and bases and stay tough and stable in heat. They are amorphous, so they hold their dimensions well.

Do not choose them in contact with ketones, chlorinated solvents or aromatic hydrocarbons, which attack them: PPS is the better fit there. For high mechanical loads, wear or friction move to PEEK. Without hot water or steam, Ultem offers similar stiffness.

Variants compared

PPSU and PSU: properties of the variants from the makers' data sheets, one column per variant
Property	PPSUQuote	PSUQuote
Mechanical
Tensile strengthISO 527, printed specimen, XY flat	55 MPa	52 MPa
Tensile modulusISO 527, printed specimen, XY flat	2,310 MPa	2,100 MPa
Elongation at breakISO 527, printed specimen, XY flat	3%	8%
Flexural strengthISO 178, printed specimen, XY flat	110 MPa	87 MPa
Flexural modulusISO 178, printed specimen, XY flat	2,215 MPa	2,050 MPa
Thermal
Heat deflection temperature (HDT) at 0.45 MPaISO 75, printed specimen, XY flat	190 °C	172 °C
Glass transition (Tg)DSC	230 °C	187 °C
Physical
DensityISO 1183	1.28 g/cm³	1.24 g/cm³
Fire behavior
Flammability ratingUL 94, base resin, not the printed part	V-0 at 1.5 mm	on request
Source	3DXTech, ThermaX PPSU 3D Printing Filament, TDS Rev 3.0, PDFread on 13 November 2026	3DXTech, ThermaX PSU 3D Printing Filament, TDS Rev 3.0, PDFread on 13 November 2026

Typical values from the makers' data sheets, measured on specimens under the conditions stated. They are not guaranteed design values: for a critical application ask us for a test on your part.

Design limits

Build volume: 350 × 350 × 450 mm
Minimum wall: 3 mm
Dimensional tolerance: ±0.6 mm up to 100 mm, ±0.75% above

These are the limits of the process, the same for every variant unless stated. For critical dimensions, talk to us before printing.

Which variant to choose

PPSU: the more resistant of the two to heat, hydrolysis and impact. Specimens printed flat: tensile strength 55 MPa, modulus 2310 MPa (ISO 527); heat deflection temperature 190 °C at 0.45 MPa (ISO 75), glass transition 230 °C. For steam and repeated sterilization.
PSU: for the same uses at lower temperatures: tensile strength 52 MPa, modulus 2100 MPa, elongation at break 8%; heat deflection temperature 172 °C at 0.45 MPa, glass transition 187 °C.

Data sheets

3DXTech, ThermaX PPSU 3D Printing Filament, TDS Rev 3.0, PDFread on 13 November 2026
Columns: PPSU
3DXTech, ThermaX PSU 3D Printing Filament, TDS Rev 3.0, PDFread on 13 November 2026
Columns: PSU

FAQ

Frequently asked questions

Sulfone polymers are used precisely for this: they resist hydrolysis and cope with hot water and steam. PPSU is the better choice for repeated sterilization cycles. The data sheets report a heat deflection temperature at 0.45 MPa of 190 °C for PPSU and 172 °C for PSU (ISO 75, specimens printed flat).

We issue no declaration of suitability for contact with food or drinking water, nor for medical use, on printed parts. PPSU is a polymer used in those fields, but suitability depends on grade, process and documentation. If your project has that requirement, write to us before asking for a quote.

Their stiffness and heat resistance are close. PPSU is tougher and copes better with hot water, steam and alkaline detergents; Ultem is stiffer and more common for ducts, insulators and tools that work dry. For parts of plumbing systems or parts to be sterilized, choose PPSU.

Do you have a part to print in PPSU and PSU?

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