... fillers or extender in the manufacture of plastics, paints,resins, thermal coatings, epoxies, mastics; light weight aggregate for cement ... . Of their many uses, microspheresare used as light weight aggregate in oil well cements, sound proofing,thermal insulation, ... density for buoyancy, improved flow, excellent thermal insulation, light weight, and high strength. Environmentally friendly and 100% ...