Cellular glass, its main composite is glass mixed with foam agent, produced through high temperature foaming and annealling, is a new type of inorganic thermal insulation material composed by thousands of tiny uniform hermetically sealed glass cells. The features are: low density, low thermal conductivity, vapor-tight, waterproof, non-combustible, mouldproof, pest proof, high mechanical strength but easy to process and anti chemical corrosion except hydrofluoric acid and etc. It contains no ozone depleting propellants, flame resistant additives or binders, without VOC or other volatile substances.