Fiberglass is a common type of fiber reinforced plastic material, made from extremely fine fibers of glass. The fibers may be woven, arranged randomly or flattened into a sheet. Used as a polymer, it results in many composite materials known a fiber reinforced polymer. Fiberglass was invented in 1938, by Russell Games Slayter of Owens-Corning as a material to be used as insulation.
Glass wool, on the other hand, is a material made from fibers of glass arranged using a binder into a texture similar to wool. Essentially used as an insulating material, the binding process traps many small pockets of air between the glasses. The small air pockets result in high thermal insulation properties used in various field of industrialization. It can be produced as slabs, rolls, sprayable or materials that can be applied onto surfaces.Glass wool was invented by Games Slayter in 1933.
Both glass wool and fiberglass are inorganic insulation materials with varying capabilities.