... 130um 3. light weight, bulk density, lower thermal conductivity Hollow Glass Microsphere for Filler and Weight ReducingUnique performance High performance ... . It can be used in paint, rubber, plastics, FRP, artificial stone, putty and other products as filler and ... fields of thermal insulation coating, putty, plastic casting polyester, FRP, SMC, radome, synthetic foam board, adhesives, printed circuit ...