ThermaX PSU


ThermaX™ PSU [Polysulfone] is a high-temperature amorphous polymer that offers excellent mechanical, thermal, and chemical resistance properties.

SKU: Select options above Brand: ThermaX™ Category:

ThermaX™ PSU 3D Printing Filament

Polysulfone (PSU) is a high-temperature aromatic sulfone polymer. PSU has excellent thermal and chemical resistance, making it well suited for demanding applications in automotive, aerospace, electronics, defense, food service, industrial, plumbing, medical, semi-con applications.

PSU is an excellent alternative to ULTEM™ 9085.

While having a lower cost per kilogram and lower density (giving you more filament per kilogram as well), it maintains superior thermal properties. Its higher Tg and HDT give it higher strength and stiffness at elevated temperatures.

Gearbox HT2™ 3D Printer: Print industrial-grade parts using our PSU filament and more with the new Gearbox™ HT2 High-Temp 3D Printer.

Print Recommendations

Ext Temp 1

Extruder Temp

Bed Temp

Bed Temp

Chamber Temp

Heated Chamber

Nozzle Settings

Nozzle Specs
No special concerns

Bed Adhesion

Bed Adhesion
Nano Polymer Adhesive

Layer Height

Layer Height
No special concerns

Drying Filamen

Drying Specs
120°C for 4 hours

Break Away Support


Benefits of ThermaX™ PSU:

  • Very high thermal properties superior to Ultem™ 9085
  • Excellent hydrolytic resistance
  • High Environmental Stress Crack Resistance (ESCR)
  • Sterilization capable, including EtO gas, radiation, steam autoclaving, plasma, dry heat and cold sterilization
  • Exceptional strength and modulus, even at elevated temperatures
  • Outstanding impact resistance
  • Highly resistant to even large (10 Mrd) doses of gamma radiation
  • Resists most common automotive fluids including gasoline, antifreeze, transmission fluids, motor oils, power steering fluid, windshield washer fluid (ESCR, 24 hrs, 100°C)
  • Inherently flame retardant with low smoke evolution and low smoke toxicity
  • Excellent dimensional stability with low creep sensitivity, low and uniform coefficient of thermal expansion, and highly reproducible part-to-part dimensions.

Filament Specifications:

1.75mm and 2.85mm +/- 0.05mm in diameter

1.24g/cm3 density

Recommended Print Settings:

  • Extruder: 350-380°C
  • Bed Temp: 140-160°C
  • Bed Prep: Nano Polymer Adhesive and 3DXTECH Polyimide Tape work best for us.
  • Heated Chamber: Recommended
  • Supports: ThermaX™ HTS High-Temp Support is designed specifically to work with high-temp materials like this one.
  • Other: No cooling fan and print speeds of 16 mm/s as a starting point.
  • Drying Instructions: 120°C for 4 hours.

ULTEM™ is a registered trademark of Sabic Innovative Plastics.


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