1. Scientific Foundations of Hollow Glass Microspheres one.one Composition and Microstructure 1.one.1 Chemical Composition: Borosilicate Dominance Hollow glass microspheres (HGMs) are generally made up of borosilicate glass, a fabric renowned for its minimal thermal expansion coefficient and chemical inertness. The chemical make-up commonly includes silica (SiO₂, fifty-90%), alumina (... https://www.jointcorners.com/post/483682_metallic-boride-powders-are-very-unique-but-functional-new-ceramic-materials-the.html