3M(TM) GLASS BUBBLES S38

3M Glass Bubbles S38 are hollow glass spheres with a typical density of 0.38 g/cc and an isostatic crush strength of 4,000 psi. These glass bubbles are designed for buoyancy and insulation in ultra-deep water applications in oil and gas drilling. The bubbles produce strong, stable voids and low thermal conductivity, helping coatings achieve the necessary compressive strength.