The Fibrefrax, Durablanket Family of lightweight needled blankets are manufactured from Fiberfrax refractory ceramic fibres and provide effective solutions to a wide spectrum of thermal management problems Crude Oil, Refonner 8. Pyrolysis heater linings.High temp. pipe, duct & turbine insulation.Tube seals, Gaskets & Expansion joints.Heat treatment furnaces, Reheating furnaces, Soaking pit cover sealing.