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