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Radel is a good choice for fabricated medical parts

Radel® (Polyphenylsulfone)

  • High tensile strength
  • Excellent heat resistance
  • Steam resistant to 400° F
  • Very high resistance to environmental stress
  • High dielectric strength and stability
  • Very good machining and finishing


This high-performance, lightweight thermoplastic withstands soldering temperatures and offers the highest impact and steam resistance of any thermoplastic. These properties make it a superior choice for medical devices.

Radel® can withstand repeated steam autoclaving with no loss of dimensional stability. It is an ideal material for all types of medical instrumentation. With high dielectric strength and stability, it is also an excellent choice for electronic assembly equipment and devices.

Radel® is available in clear and custom colors. It is not appropriate for food contact applications and its properties will degrade when exposed to sunlight.


  • Dental and surgical tools and instruments
  • Insulin pens, blood glucometers, tubing, sterilization trays and cauterization devices
  • End caps and other small components for pharmaceutical and electronics equipment
  • Electronic assembly equipment
  • Fluid handling couplings and fittings


Our application engineers can help. With decades of experience in plastic material selection, we'll help you choose the optimal plastic for your application and budget.

To compare
the cost of this material to other thermoplastics, click here.

General Material Properties

Property   Metric units   English units
Density   1.29e3 - 1.3e3 kg/m^3   0.0466 - 0.047 lb/ft^3
Yield Strength   5.3e7 - 5.85e7 Pa   7.69 - 8.48 ksi
Tensile Strength   6.63e7 - 7.31e7 Pa   9.62 -10.6 ksi
Elongation   0.558 - 0.645 % strain   55.8 - 64.5 % strain
Hardness (Vickers)   1.56e8 - 1.72e8 Pa   15.9 -17.5 HV
Impact Strength (notched)   1.1e4 - 1.22e4 J/m^2   5.23 -5.81 ft.lbf/in^2
Fracture Toughness   2.65e6 - 6.08e6 Pa/m^0.5   2.41 - 5.53 ksi/in^0.5
Young's Modulus   2.29e9 - 2.4e9 Pa   0.332 - 0.348 10^6 psi
Max Service Temperature   168 - 186 °C   334 - 367 °F
Insulator or Conductor   Insulator   Insulator
Specific Heat Capability   1.45e3 - 1.51e3 J/kg °C   0.347 - 0.361 BTU/lb. °F
Thermal Expansion Coefficent   5.1e-5 - 6.1e-5 strain/°C   28.3 - 33.9 µstrain/°F
CO2 Footprint   1.77 - 1.8 kg/kg   1.77 - 1.8 lb/lb
Recycleable   Yes   Yes

The information on this page is intended as general guidance only and is only accurate at the time of posting (see date below). Specific material properties vary by manufacturer. Please contact a Dielectric application engineer for help in choosing the optimal material for your application and budget.

Posting Date: August 16, 2012