Material Information

Celazole® is Dupont’s brand name for the high performance imidized thermoplastic called PBI. It is a very clean material in terms of ionic impurity and does not outgas with the exception of water. This makes Celazole® PBI ideal for semiconductor manufacturers and vacuum chamber applications. It is the highest performing engineering plastic available. Celazole® PBI has the highest heat resistance and mechanical property retention over 400º F of any unfilled plastic. It also has the best wear resistance and load carrying capacity than any other engineering plastic. Overall, it is an excellent thermal insulator, has excellent ultrasonic transparency, has good chemical resistance, and other plastics in melt do not stick to it. Cerlazole® PBI is available in the forms of sheet and rod.



  • High heat insulator bushings
  • Electrical connectors
  • Ball valve seats
  • Wafer retaining rings for gas plasma etching
  • Vacuum tips
  • Wafer carriers
  • Contact seals
  • Thermal isolators
  • Guide rollers
  • Aerospace applications
  • Automotive applications
  • Chemical process


  • The best heat resistance and mechanical retention over 400º F of any unfilled plastic
  • High compressive and dimensional stability
  • Best wear resistance and load carrying capacity of all engineering plastics
  • Excellent electrical insulator
  • No outgas (except water)
  • High water absorption
  • Soluble in aprotic solvents
  • Very clean in terms of ionic impurity
  • Excellent ultrasonic transparency


Astm Test Method

Celazole® (PBI)

Density (lb/in^3) D792 0.047
Specific Gravity D792 1.3
Water Absorption @ 24 hours (%) D570 0.4


Tensile Strength (PSI) D638 23,000
Tensile Modulus (PSI) D638 850,000
Tensile Elongation at Break (%) D638 3
Flexural Strength (PSI) D790 32,000
Flexural Modulus (PSI) D790 950,000
Izod Impact (Notched), ft-lb/in D256 0.5
D785 E105


Coefficient of Thermal
Expansion, 10^-5/°F
D696 1.3
Heat Deflection Temperature 264 psi, ºF D648 800
Glass Transition Temperature, °F D3418 750
Continous Service Temp (Operating), °F  – 650
Flammability Rating UL94 V-0


Dielectric Strength, Short Term,
(Volts/Mil) @ .125″ Thick
D149 550
Volume Resistivity (ohm-cm) @ 50% RH D257 >10^13
Dielectric Constant at 1 MHz D150 4.2
Dissipation Factor at 1 MHz D150


The information contained herein 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.