1. True Density:0.20-0.60 g/cm3 2. Particle ... , putty, plastic casting polyester, FRP, SMC, radome, synthetic foam board, adhesives, printed circuit board substrate, RTM, bowling, fan blades, emulsion explosives, golf, sealant ... talc must be used to obtain the same effect of 1 kg of hollow glass microsphere. Hence the desired ideal density ...