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Polybenzimidazole (PBI)

By sensXPERT

Polybenzimidazole (PBI)

Polybenzimidazole (PBI)

Polymer Type: Thermoset

Key Properties

  • Exceptional thermal stability: Withstands extremely high temperatures (up to 500°C) without melting, charring, or significant property loss.
  • Outstanding flame resistance
  • Excellent chemical resistance: Resists a wide range of chemicals, including acids, bases, and solvents.
  • High mechanical strength and modulus: Maintains good mechanical properties even at elevated temperatures.
  • Low moisture absorption: Retains dimensional stability and performance under humid conditions.


  • Aerospace: High-temperature aircraft components, protective clothing for firefighters and pilots, rocket motor parts.
  • Automotive: Engine components, exhaust systems, brake pads.
  • Semiconductor industry: High-purity filtration materials, photolithography masks.
  • Chemical processing: Membranes, filters, gaskets, reactor linings.
  • Medical devices: Implantable components, medical textiles, sterilization pouches.

Additional Information

Polybenzimidazole (PBI) is a high-performance polymer known for its remarkable thermal and chemical stability. It is synthesized from monomers containing benzimidazole rings, which are highly stable due to their rigid structure and strong intermolecular forces. This structure allows PBI to resist degradation and maintain its properties even under harsh conditions.

PBI is suitable for demanding applications. Its exceptional thermal stability makes it suitable for use in high-temperature environments where other materials would fail. Its flame resistance makes it ideal for safety-critical applications. Its chemical resistance allows it to withstand harsh chemicals without degradation. And its good mechanical properties ensure it can perform under demanding loads.

However, PBI is also a relatively expensive material, which can limit its use in some applications. Additionally, it can be difficult to process and requires specialized techniques.

Despite these limitations, PBI remains a valuable material for a variety of demanding applications.

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