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Celazole® PBI is the highest performance engineering plastic available today. It offers the highest heat resistance and mechanical property retention over 400°Celazole PBI F of any unfilled plastic. It has better wear resistance and load carrying capabilities at extreme temperatures than any other reinforced or un-reinforced engineering plastic.

As an un-reinforced 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.

Celazole® PBI is extremely hard and can be challenging to fabricate. Polycrystalline diamond tools are recommended when fabricating production quantities. Celazole® tends to be notch sensitive. All corners should be radiused (0.040″ min.) and edges chamfered to maximum part toughness. High tolerance fabricated components should be stored in sealed containers (usually polybags with desiccant) to avoid dimension changes due to moisture absorption. Components rapidly exposed to temperatures above 400° F should be “dried” prior to use or kept dry to avoid deformation from thermal shock.

Brand Names

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, use the form below to contact a representative.

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At a Glance

Generic Name
Polybenzimidazole

Available In
Sheet, Rod, Tube, Film

Certifications
ITAR Registered

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Technical Information

Stock Products Properties Applications Advantages

Stock Products

TypeSizeLengthColor
Sheet 1/2″ – 1.50″ THK 12" x 12″ CTS Black
Rod .375″ – 3.875″ DIA Standard Sizes – CTS Black
Tube 1.625″ – 10.75″ OD / .750 – 7.00 ID 10′ Black
Film

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

Properties

Physical PropertiesUnitsASTMResults
Specific Gravity g/cm3 D792 1.3
Mechanical PropertiesUnitsASTMResults
Tensile Strength @yield psi D638 20,000
Tensile Modulus psi D638 850,000
Flexural Strength psi D790 32,000
Flexural Modulus psi D790 950,000
Compressive Strength psi D695 50,000
Compressive Modulus psi D695 900,000
Hardness. Rockwell R D785 M125
Thermal PropertiesUnitsASTMResults
Coefficient of Thermal Expansion x 10^-5in/in/°F E831 1.3
Heat Deflection Temp at 264 psi °F 800
Flammability Rating UL94 V – 0
Electrical PropertiesUnitsASTMResults
Dielectric Strength V/mil D149 550

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.

Applications

  • Bushings
  • Water Retaining Rings for Gas
  • Plasma Etching
  • Vacuum Tips
  • Wafer Carriers
  • Contact Seals
  • Thermal Insulators
  • Guide Rollers
  • Electrical
  • Ball seat valves
  • Clamp rings

Advantages

  • Highest mechanical properties of any plastic over 400° F
  • Highest heat deflection temperature of any plastic at 800° F with continuous service capability of 750° F in inert environments, or 650° F in air with short term exposure potential to 1,000° F
  • Lowest coefficient of thermal expansion and highest comprehensive strength of all unfilled plastics
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