1. Scientific Foundations of Hollow Glass Microspheres one.1 Composition and Microstructure 1.one.one Chemical Composition: Borosilicate Dominance Hollow glass microspheres (HGMs) are mainly made up of borosilicate glass, a material renowned for its small thermal growth coefficient and chemical inertness. The chemical make-up normally consists of silica (SiO₂, 50-ninety%), alumina (Al... https://www.dostally.com/post/345007_metallic-boride-powders-are-very-unique-but-functional-new-ceramic-materials-the.html