1.Product:High-performance hollow glass microspheres 2.Appearance:White fine powder ... Composition:Soda lime borosilicate Product name:High-performance hollow glass microspheresAppearance: White fine powderParticle shape: Hollow sphereComposition: Soda ... putty, plastic casting polyester, FRP ,SMC, synthetic foam, adhesives, printed circuit board substrate, RTM, bowling, fan blades, & caulking materials ...