The heat protection fiber
Lenzing™ FR offers incorporated protection from burns, heat stress, and heat stroke caused by flash fires, radiant heat, electric arcs, molten metal, and flammable liquids. Made from wood, a natural raw material, the fiber inherently protects from heat and flame. Due to its natural properties and incorporated heat protection, Lenzing™ FR is used for protective clothing that must perform in extreme conditions. In life threating situations, Lenzing™ FR can save lives!
You can find here some information on Lenzing™ FR, the heat protection fiber.