3M™ Glass Bubbles HGS8000X are hollow glass spheres designed for use in drilling, completion, and workover fluids, as well as cement slurries for the oil and gas industry. With a nominal density of 0.42 g/cc and an isostatic crush strength of 8,000 psi (pounds per square inch), HGS8000X are well-suited for use in moderate to deep wells.