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Hollow Glass Beads The high-performance hollow glass microspheres, a kind of ultra-light inorganic non-metallic powder with hollow "ball-bearing" shapes, have been developed into a new type of high-performance lightweight material and widely applied in recent years. It will be the main direction for new-type compound materials in the future. Its true density is 0.20-0.60 g/cm3; particle size is 2-120μm.