... 60 g/cm3 2. Particle Size : 2-130um 3. light weight, bulk density, lower thermal conductivity Hollow Glass Microsphere for Filler ... , plastic casting polyester, FRP, SMC, radome, synthetic foam board, adhesives, printed circuit board substrate, RTM, bowling, fan blades, emulsion explosives, golf ... 4.4 g/cm3 (The data adopted is the true particle density). In order to obtain the equal size, 14 kilograms ...