One. Scientific Foundations of Hollow Glass Microspheres one.one Composition and Microstructure 1.one.1 Chemical Composition: Borosilicate Dominance Hollow glass microspheres (HGMs) are mainly composed of borosilicate glass, a cloth renowned for its very low thermal growth coefficient and chemical inertness. The chemical makeup generally features silica (SiO₂, 50-90%), alumina (Al₂O₃,... https://www.malikmobile.com/story/194003-metallic-boride-powders-are-very-unique-but-functional-new-ceramic-materials-the.html