... a kind of ultra-lightweight inorganic non-metallic material (powder) with hollow structure(microsphere), and it is a versatile and high ... is 0.20-0.60g/cm3 with 2-120μm in diameter. It owns features with light weight, large bulky, low thermal conductivity, high ... insulation materials, artificial marble, PVC foam, low density oil drilling, light cement, and other deep-sea buoy etc.