1. Scientific Foundations of Hollow Glass Microspheres 1.1 Composition and Microstructure one.1.1 Chemical Composition: Borosilicate Dominance Hollow glass microspheres (HGMs) are mostly made up of borosilicate glass, a material renowned for its small thermal growth coefficient and chemical inertness. The chemical make-up normally includes silica (SiO₂, 50-ninety%), alumina (Al₂O₃, te... https://www.scoop.it/topic/okok0972/p/4168399964/2025/10/14/exactly-what-is-calcium-stearate-powder