3M™ Glass Bubbles HGS Series are hollow glass microspheres engineered for greater survivability under demanding downhole conditions. Designed with a high strength-to-weight ratio and repeatable manufactured specification, 3M™ Glass Bubbles HGS series are available in a wide range of strengths and densities for drilling optimisation, completion, workover, abandonment, and replacement fluid applications. They are used to help maintain downhole pressure control and efficiencies in drilling operations. The use of 3M™ Glass Bubbles can help eliminate the need for specialised equipment used in foamed or aerated systems.