Hollow glass is composed of two sheets of  glass. Between the two sheets of glass, there is an aluminum spacer filled with desiccant. The aluminum spacer and sheets of glass are adhered and sealed by butyl, and then polysultide or silicon.

It has remarkable characterstic in improving the building, heat-preservation and insulation, sound insulation and capacity in avoiding the formation of dew.

It is widely used as door, window, partition, curtain wall of hotels, high residential, hospitals, offices, government institutes, studios and mart buildings etc.