3M™ Glass Bubbles HGS19K46 are hollow microspheres made of soda-lime borosilicate glass with a true density of 0.46 g/cm³ and an isostatic crush strength of 19,000 psi / 1310 bar.
HGS19K46 Glass Bubbles are designed for use in drilling, completion, and workover fluids, as well as in cement slurries for use in deep and ultra deep wells in the oil and gas industry.