Polysulfone (PSU) Injection Molding

Polysulfone or PSU is a durable, rigid thermoplastic that can withstand use at high temperatures


Polysulfone is an amorphous thermoplastic with natural transparency. In most cases the plastic is suitable for continuous use up to 149°C (300°F). PSU is also resistant to degradation by gamma or electron beam radiation.

We offer two grades of PSU through our injection molding service:

Udel P-1700: High resistance to mineral acids, alkali and salt solutions. It also possesses good resistance to detergents and hydrocarbon oils.

Udel P-3703: A high-flow grade of PSU that fills thin walls well. Can be more susceptible to cracking than P-1700 when in harsh environments.


Polysulfane (PSU) Material Properties

  Tensile Modulus
Tensile Stress

Tensile Elongation 

Melt Mass-Flow Rate Volume Resistivity Data Sheet
Test Method ASTM D638 ASTM D638 ASTM D638 ASTM D1238 ASTM D257  
Udel P-1700 2,480 MPa 70.3 MPa 50 to 100% 6.5 g/10 min 3.0E+16 ohms-cm VIEW PDF
Udel P-3703 2,480 MPa 70.3 MPa 50 to 100% 17 g/10 min 5.0E+16 ohms-cm VIEW PDF

Grab a Design Cube

Want to learn more about injection molding? Sign up to receive a Design Cube. This physical aid demonstrates how to properly design features commonly found on molded parts.


analysis for peek molded part

Polysulfone Injection Molding Applications

PSU is a good material choice for molded parts that will have to endure high temperature environments. Its chemical resistance and compliance with gamma sterilizability requirements also lends itself well for medical applications.

PSU is often used for the following parts:

  • Medical devices and components
  • Appliances components
  • Dental parts
  • Surgical instruments
  • Industrial applications
  • Electrical parts

Related Resources