1. Scientific Foundations of Hollow Glass Microspheres 1.1 Composition and Microstructure one.1.1 Chemical Composition: Borosilicate Dominance Hollow glass microspheres (HGMs) are mainly composed of borosilicate glass, a fabric renowned for its small thermal expansion coefficient and chemical inertness. The chemical makeup generally includes silica (SiO₂, 50-90%), alumina (Al₂O₃, 10-5... https://socialcreditu.com/post/9647_metallic-boride-powders-are-very-unique-but-functional-new-ceramic-materials-the.html