... -0.60g/ccParticle size: about 2-120μmCompressive strength: about 3-60MPaThermal conductivity: 0.03-0.06w/m.kApplicationHollow Glass Microspheres ... , putty, plastic casting polyester, FRP ,SMC, synthetic foam, adhesives, printed circuit board substrate, RTM, bowling, fan blades, & caulking materials, emulsion explosives, golf ...