... 0.60 g/cm3 2. Particle Size : 2-130um 3. light weight, bulk density, lower thermal conductivity Hollow Glass Microsphere for ... with 2-130μm in diameter. It owns features with light weight, large bulky, low thermal conductivity, high compressive strength, ... pipeline insulation materials, artificial marble, low density oil drilling, light cement, and other deep-sea buoy etc. Why should we choose Hollow ...