1.1 This specification covers the composition, dimensions, and physical properties of metal-mesh covered mineral fiber (rock, slag, or glass) blanket and blanket-type pipe insulation (typically on 24 in. (610 mm) diameters or larger) for us This specification covers mineral fiber blanket insulation and blanket-type pipe insulation (metal-mesh covered) (industrial type). Mineral fiber metal-mesh covered blanket shall be composed of rock, slag, or glass processed from the molten state into