One. Scientific Foundations of Hollow Glass Microspheres 1.one Composition and Microstructure 1.one.1 Chemical Composition: Borosilicate Dominance Hollow glass microspheres (HGMs) are largely made up of borosilicate glass, a fabric renowned for its small thermal expansion coefficient and chemical inertness. The chemical makeup normally involves silica (SiO₂, fifty-90%), alumina (Al₂O₃... https://www.bondhuplus.com/post/960558_metallic-boride-powders-are-very-unique-but-functional-new-ceramic-materials-the.html