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PBI (Polybenzimidazole fiber) is frequently used in safety and protective applications.

pbi PBI (Polybenzimidazole fiber) is a manufactured fiber in which the fiber forming substance is a long chain aromatic polymer having recurrent imadazole groups as an intricate part of the polymer chain. It can be used in its raw state, or blended with other fibers (Kevlar®/PBI). PBI has high moisture regain, low modulus, and comfort properties similar to cotton. These properties and those below make PBI, and blends of PBI, very useful in safety and protective applications.

PBI properties include:
  • High chemical resistant
  • Will not burn in air
  • No melting point and will not drip
  • Maintain properties when exposed to extreme heat
Sample PBI applications:
  • Shoulder straps
  • Harness webbing
  • Chin straps
  • Helmet suspension
  • Lap belts

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Tenacity (g/denier) 2.7
Elongation at break (%) 27
Shrinkage at 177°C (%) <1.0
Melting point (°F) Does not burn
In flame Non-flammable
After flame Non-flammable
Chemical resistance Good chemical resistance
Specific gravity (g/cc) 1.4
Moisture regain (%) 15
Disclaimer: Values are only a guide. Actual values depend on manufacturer and exact type of yarn. Please contact our engineering team for specific values as they relate to your application.

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