1. Scientific Foundations of Hollow Glass Microspheres one.1 Composition and Microstructure 1.one.one Chemical Composition: Borosilicate Dominance Hollow glass microspheres (HGMs) are principally composed of borosilicate glass, a fabric renowned for its reduced thermal growth coefficient and chemical inertness. The chemical make-up generally consists of silica (SiO₂, 50-ninety%), alum... https://www.bondhuplus.com/post/960558_metallic-boride-powders-are-very-unique-but-functional-new-ceramic-materials-the.html