... the density High-performance hollow glass bead is a kind of ultra-lightweight inorganic non-metallic powder with hollow microsphere, and ... years. It will be the new composite mainstream materials at twenty-first century. Its true density is 0.20-0 ... conductivity, high compressive strength, smoothly mobility. It can be used in cementing slurry, paint and coatings, rubber, plastics, glass, steel, ...