1. Scientific Foundations Of Hollow Glass Microspheres 1.one Composition and Microstructure 1.1.one Chemical Composition: Borosilicate Dominance Hollow glass microspheres (HGMs) are largely composed of borosilicate glass, a fabric renowned for its reduced thermal growth coefficient and chemical inertness. The chemical make-up generally involves silica (SiO₂, fifty-90%), alumina (Al₂O₃... https://www.jointcorners.com/post/483682_metallic-boride-powders-are-very-unique-but-functional-new-ceramic-materials-the.html