Engineering Plastics Polybenzimidazole - PBI

Polybenzimidazole (PBI) is a high-performance engineering thermoplastic known for its exceptional thermal stability, flame resistance, and mechanical properties. Here’s an overview of polybenzimidazole (PBI):

Key Features:

  1. Exceptional Thermal Stability: PBI exhibits outstanding thermal stability, with a glass transition temperature (Tg) exceeding 400°C (752°F) and a decomposition temperature above 600°C (1112°F). This makes it one of the most heat-resistant polymers available.

  2. Flame Resistance: PBI is inherently flame retardant and does not melt or drip when exposed to fire. It has a high limiting oxygen index (LOI) of over 40%, making it self-extinguishing and suitable for applications where fire safety is critical.

  3. Chemical Resistance: PBI has excellent resistance to a wide range of chemicals, including acids, bases, solvents, and hydrocarbons. It is highly resistant to degradation, even in harsh chemical environments.

  4. Mechanical Properties: Despite its high thermal stability, PBI also exhibits good mechanical properties, including high strength, stiffness, and impact resistance. It maintains its properties at elevated temperatures, making it suitable for demanding applications.

  5. Low Thermal Expansion: PBI has a low coefficient of thermal expansion, which means it maintains dimensional stability over a wide temperature range. This property makes it suitable for applications requiring precise tolerances.

  6. Electrical Insulation: PBI is an excellent electrical insulator, with high dielectric strength and low electrical conductivity. It is often used in electrical and electronic applications where insulation properties are critical.

  7. Biocompatibility: PBI is biocompatible and resistant to sterilization methods such as autoclaving, making it suitable for medical and healthcare applications such as surgical instruments and implants.


  1. Aerospace: PBI is used in aerospace applications such as aircraft engine components, jet engine seals, bearings, and thermal insulators due to its high temperature resistance, chemical resistance, and mechanical properties.

  2. Automotive: PBI is used in automotive applications such as high-temperature gaskets, seals, bearings, and electrical connectors for engines and exhaust systems due to its heat resistance and durability.

  3. Electronics: PBI is used in electronics for manufacturing components such as connectors, sockets, insulators, and circuit boards due to its electrical insulation properties and resistance to high temperatures.

  4. Oil and Gas: PBI is used in oil and gas exploration and production for manufacturing seals, gaskets, packings, and other components exposed to high temperatures and harsh chemicals in drilling and processing operations.

  5. Chemical Processing: PBI is used in chemical processing industries for manufacturing pumps, valves, seals, and other components exposed to corrosive chemicals and high temperatures.

  6. Medical Devices: PBI is used in medical devices and implants such as surgical instruments, orthopedic implants, and dental instruments due to its biocompatibility, sterilizability, and durability.

  7. Industrial Applications: PBI finds applications in various industrial settings for manufacturing components such as bearings, bushings, gears, and seals that require exceptional heat resistance and chemical resistance.

Overall, Polybenzimidazole (PBI) is a high-performance engineering plastic with unique properties that make it suitable for demanding applications in aerospace, automotive, electronics, oil and gas, medical, and industrial sectors. Its exceptional thermal stability, flame resistance, chemical resistance, and mechanical properties make it a preferred choice for applications where extreme conditions are encountered.

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