1. Scientific Foundations of Hollow Glass Microspheres 1.1 Composition and Microstructure 1.one.one 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.bib.az/post/229341_trunnano-focuses-on-providing-a-full-range-of-high-quality-3d-printing-powders-t.html