One. 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 very low thermal expansion coefficient and chemical inertness. The chemical make-up typically features silica (SiO₂, 50-90%), alumina (Al... https://okok0972.blogspot.com/2025/10/exactly-what-is-calcium-stearate-powder.html