3M(TM) GLASS BUBBLES K25

3M Glass Bubbles K25 glass bubbles have a density of 0.25 g/cc and an isostatic crush strength of 750 psi. These general purpose spheres have a good strength-to-density ratio and are designed for use in a variety of intermediate depth (e.g up to 5,000 feet of sea water) buoyancy applications, such as drill riser buoyancy modules