1. Scientific Foundations Of Hollow Glass Microspheres 1.1 Composition and Microstructure one.1.one 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 typically consists of silica (SiO₂, fifty-90%), alumina (Al₂O₃, https://friendstrs.com/post/167844_metallic-boride-powders-are-very-unique-but-functional-new-ceramic-materials-the.html