... /cm3 2. Particle Size : 2-130um 3. light weight, bulk density, lower thermal conductivity Hollow Glass ... -130μm in diameter. It owns features with light weight, large bulky, low thermal conductivity, high ... board, adhesives, printed circuit board substrate, RTM, bowling, fan blades, emulsion explosives, golf, sealant, pipeline insulation materials, artificial marble, low density oil drilling, light ...