... :White fine powder 3.Composition:Soda lime borosilicate Product name:High-performance hollow glass microspheresAppearance: White fine powderParticle shape: Hollow sphereComposition: Soda ... ,SMC, synthetic foam, adhesives, printed circuit board substrate, RTM, bowling, fan blades, & caulking materials, emulsion explosives, golf, sealant, pipeline insulation materials ...