It’s a high temperature resistant and flame retardant fiber. The application is similiar to meta-aramid. But PI fiber has its own advantages.
The long-term service temperature is 260°C. The decomposition temperature is 560°C. The LOI is 38%, it means it’s none-flameble fiber.
UV resistant and radiation resistant. Far lower damage length under fire compared aramid fiber.
Polyimide fiber is applicable in many products, but it is used best in niche-applications with extreme standards for the material:
FR Protective clothing: e.g. military fligth clothing, flame resistand underwear, firefighter uniform etc.
High temperature filtration and industrial insulation: e.g. dedusting filtration for cement factories, steel or powder plants, air filtration for painting area operated at more than 300°C .
Composite material: taking advantage of insulation, flame retardance and high emperature resistance, chopped fiber can be used as reinforced material.