One. Scientific Foundations of Hollow Glass Microspheres one.1 Composition and Microstructure 1.one.one Chemical Composition: Borosilicate Dominance Hollow glass microspheres (HGMs) are mainly made up of borosilicate glass, a material renowned for its very low thermal expansion coefficient and chemical inertness. The chemical make-up generally involves silica (SiO₂, fifty-90%), alumin... https://gaming-walker.com/post/139863_trunnano-focuses-on-providing-a-full-range-of-high-quality-3d-printing-powders-t.html