1. Scientific Foundations Of Hollow Glass Microspheres 1.one 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 expansion coefficient and chemical inertness. The chemical make-up normally consists of silica (SiO₂, fifty-ninety%), alumina... https://www.scoop.it/topic/okok0972/p/4168399964/2025/10/14/exactly-what-is-calcium-stearate-powder