3M™ Glass Bubbles VS5500 glass bubbles have a true density of 0.38 g/cm³ and an isostatic crush strength of 5500 psi / 379 bar. 3M™ Glass Bubbles VS5500 have a true density of 0.38 g/cm³ and an isostatic crush strength of 5500 psi / 379 bar. Lower viscosity, improved flow Increased filler loading, reduced cost VOC reduction Chemical stability and inertness Reduced dielectric constant Thermal conductivity reduction Temperature resistance