HOLLOW GLASS MICROSPHERES Hollow Glass Microspheres is a Free Flowing White Powder and showed to be hollow sealed sphere under microscope. Specification Appearance: White fine powder Particle shape: Hollow sphere Composition: Soda lime borosilicate quality True density: 0.25-0.60g/cc Particle size: about 2-120μm Compressive strength: about 3-60MPa Thermal conductivity: 0.03-0.06w/m.k Application Hollow Glass Microspheres' applications are in the fields of Thermal insulation coating, putty, plastic casting polyester, FRP ,SMC, synthetic foam, adhesives, printed circuit board substrate, RTM, bowling, fan blades, & caulking materials, emulsion explosives, golf, sealant, pipeline insulation materials, artificial marble, PVC foam, low density oil drilling, light cement, and other deep-sea buoy etc. For more information, please kindly come to us for an inquiry. Thank you.