Fiber glass materials are made of molding silica and glass into fibers. They can with stand temperatures up to 200 C0 yet they are venerable to water. They are used for mild heat and acoustic insulation.
They are 1.2 meters long and of density 64 kg/m3 with Aluminum facing.
The thicknesses range from 20 to 65 mm & the internal diameter range from 1/2 to 20 inches.