... cm3 2. Particle Size : 2-130um 3. light weight, bulk density, lower thermal conductivity Hollow Glass ... of ultra lightweight inorganic non metallic powder with hollow microsphere, and it is a versatile ... 15-0.60g/cm3 with 2-130μm in diameter. It owns features with light weight, large bulky, ... insulation materials, artificial marble, low density oil drilling, light cement, and other deep-sea buoy etc. Why ...