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Celazole® PolyBenzImidazole Specifications

904 West 6th Street, Shiner, Texas 77984 USA
Phone: 1-361-594-2941     Fax: 1-361-594-2349     E-Mail:


BPI Home Page | Applications | Materials Guide | Contact Us!

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click to resize photo Celazole® PBI is a high performance imidized thermoplastic. Chemically, Celazole® PBI is PolyBenzImidazole.

Celazole® PBI is the highest performing engineering plastic currently available. It offers the highest heat resistance (it does not melt) and mechanical property retention over 400°F (205°C) of any unfilled plastic. It has better wear resistance and load carrying capabilities at extreme temperatures than any other reinforced or unreinforced engineering plastic.

As an unreinforced material, Celazole® PBI is very clean in terms of ionic impurity and it does not outgas (except water). These characteristics make this material very attractive to semiconductor manufacturers for vacuum chamber applications. Celazole® PBI has excellent ultrasonic transparency which makes it an ideal choice for parts such as probe tip lenses in ultrasonic measuring equipment.

Celazole® PBI is also an excellent thermal insulator. Other plastics in melt do not stick to PBI. These characteristics make it ideal for contact seals and insulator bushings in plastic production and molding equipment.


• Wafer retaining rings for gas plasma etching • Vacuum tips • Wafer carriers • Contact seals • Insulator bushings • Thermal isolators • Guide rollers

PBI is also available in powder, pellet, filament and solution
forms for compression molding, casting, and R & D purposes.
Contact Mr. Mike Gruender, PBI Polymer Product Manager for
PBI Performance Products, Inc. in Charlotte, NC (USA) at
1-704-554-3036 or e-mail him at

see also datasheets for:
Celazole T-Series PEEK-PBI Blend | Duratron CU60 PBI | Duratron D PI PolyImide | Other Duratron Products

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ASTM or UL test Property Celazole® PBI
D792 Density (lb/in³)
D570(2) Water Absorption, 24 hrs, Immersion (%) 0.40
D570(2) Water Absorption, Saturation, Immersion (%) 5.0
D638 Tensile Strength (psi) @ 150°F (65°C) 16,000
D638 Tensile Strength (psi) @ 300°F (150°C) 12,000
D638 Tensile Modulus (psi) 850,000
D638 Tensile Elongation at Break (%) 2.0
D790 Flexural Strength (psi) 32,000
D790 Flexural Modulus (psi) 950,000
D695 Compressive Strength (psi) (10% def.) 50,000
D695 Compressive Modulus (psi) 900,000
D785 Hardness, Rockwell M125 / E105
D2240 Hardness, Shore D 94
D256, Type A IZOD Notched Impact (ft-lb/in) 0.5
QTM 55007 Coefficient of Friction (Dry vs. Steel) Dynamic 0.24
QTM 55007 Limiting PV (4:1 Safety Factor) (psi-ft/min 37,500
QTM 55010 Wear Factor "K" x 10-10(in3-min/ft-lb-hr 60
E831 Coefficient of Linear Thermal Expansion
(x 10-5 in./in./°F)
@ Temperature -40 to 300 °F
D648 Heat Deflection Temp (°F / °C)
at 264 psi

800 / 427
D3418 Glass Transition Temp (°F / °C) 775 / 413
- Max Service Temp (°F / °C) (long term)
600 / 316
F433 Thermal Conductivity

UL94 Flammability Rating (1/8 inch, estimated rating) V-0
D149 Dielectric Strength (V/mil) short time, 1/8" thick 550
D150 Dielectric Constant at 1 MHz 3.2
D150 Dissipation Factor at 1 MHz 0.0030
EOS/ESD S11.11 Surface Resistivity (ohms/square) > 1013

NOTE: 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.
CELAZOLE is a registered trademark of PBI Performance Products, Inc.
DURATRON is a registered trademark of Quadrant Engineering Plastic Products.

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Boedeker Plastics, Inc.
904 West 6th Street, Shiner, Texas 77984 USA
USA TOLLFREE : 1-800-444-3485
Phone: 1-361-594-2941     Fax: 1-361-594-2349     E-Mail:

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