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A tough. rigid. high strength transparent thermoplastic. Polysulfone (PSU) maintains its properties over a wide temperature range (-150° F to above 300° F). often replacing polycarbonates when higher temperatures. improved chemical resistance or autoclavability is required.

Polysulfone (PSU) belong to a family of sulfur-containing thermoplastics, closely related to polyethersulfone (PES). Generally, this amber colored semi-transparent polysulfone is a high cost, rigid, material with low moisture absorption. Reinforcement improves toughness and further enhances dimensional stability, but turns materials opaque. In addition, polysulfones are characterized by high strength, very high surface-temperature limits, low creep, good electrical characteristics, transparency, self-extinguishing ability, and resistance to greases, many solvents, and chemicals, relative to polycarbonates.Polysufones may be processed by extrusion, injection molding, and blow molding. Polysulfone can be used as an alternative to polycarbonate or acrylic for applications requiring high temperature performance or exposure to hot water and steam.

Food-grade polysulfone and custom colors are available. Only food-grade polysulfone is FDA, NSF It is an amorphous high performance thermoplastic offering excellent mechanical, electrical, and improved chemical resistance relative to polycarbonate, 3A-Dairy and USP Class VI compliant.

Brand Names

  • Ensifone®
  • Thermalux®
  • Udel®
  • Unifone® PSO
  • PSU 1000
  • Sustason® PSU
  • Hydex® 6201

Emco Industrial Plastics doesn’t claim to represent all of the manufacturers or trade name products listed. This list is intended as a guide of typical materials available for purchase from Emco Industrial Plastics, Inc. For additional information, contact an Emco Industrial Plastics representative with the form below.

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At a Glance

Generic Name
Polysulfone, Unfilled

Available In
Sheet, Rod, Tube

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Technical Information

Stock Products Properties Applications Advantages

Stock Products

Sheet .030″ – 4″ TH Standard 24″ x 48″, 48″ x 96″, CTS Amber
Rod 3/16″ – 8″ DIA CUSTOM Amber
Tube 2″ – 14″ ID; 4″ – 15″ OD Standard Amber

Give us your cut-to-size dimensions. We will precision-cut these plastics to your exact size. Additional sizes and colors available upon request.


Physical PropertiesUnitsASTMResults
Density lb/in³ D792 0.045
Water Absorption, 24 hrs % D570 0.3
Mechanical PropertiesUnitsASTMResults
Tensile Strength @yield psi D638 10200
Tensile Modulus psi D638 360000
Tensile Elongation @Break % D638 30
Flexural Strength psi D790 15000
Flexural Modulus psi D790 400000
Compressive Strength psi D695 13000
Compressive Modulus psi D695 375000
Hardness, Rockwell R D785 M82/R128
IZOD Impact Strength Notched ft-lb/in D256 1.3
IZOD Impact Strength Un-notched ft-lb/in D256 NO BREAK
Thermal PropertiesUnitsASTMResults
Coefficient of Linear Thermal Expansion (x 10⁻⁵ in./in./°F) D256 3.1
Heat Deflection Temp at 66 psi °F D648 358
Heat Deflection Temp at 264 psi °F 340
Melting Temperature °F D3418 374
Max Operating Temp °F 300
Thermal Conductivity BTU-in/ft²-hr-°F C177 3.1 x 10⁻⁵
Flammability Rating UL94 HB
Electrical PropertiesUnitsASTMResults
Dielectric Strength V/mil D149 425
Dielectric Constant 1MHz D150 3.14
Dissipation Factor @ 60 Hz 1MHz D150 0.0008
Volume Resistivity, 50% RH ohm-cm D257 5 x 10¹⁶

NOTE: The property values presented above are typical values intended for reference and comparison purposes only. They should NOT be used as a basis for design specifications or quality control. Contact us for manufacturers’ complete material property datasheets. All values at 73°F (23°C) unless otherwise noted.


  • Sensors and Analytical instrumentation
  • Semiconductor process equipment components
  • Automotive electrical/electronic
  • Electrical Insulators, Connectors and Components
  • Plumbing fittings and Manifolds
  • Medical instrument components
  • Dairy equipment


  • Dimensionally stable
  • Autoclavable
  • Impact Resist
  • Excellent Strength and Rigidity
  • Superior Electrical Properties
  • Hydrolysis resistant
  • Radiation stability
  • High chemical resistance
  • Resistant to degradation from hot water and steam
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