PBI is an organic high performance fiber and was originally developed by Celanese for the NASA Apollo space program because of its inherent flame resistance properties and chemical stability. PBI is the trade name for polybenzimidazole. Contact WHY CHOOSE PBI FIBER? The PBI fiber does not Burn, Melt or Contribute Fuel to Flames. Available as long and short staple fiber in natural color and black. PBI Performance Products, Inc. is the sole producer of PBI fiber in the world. High moisture regain.