Bubble BeadIt is a floating fly ash hollow sphere with a grayish white color, thin-walled and hollow, and extremely light in weight, with a specific gravity of720kg/m3(Heavy-duty)418.8kg/m3(Lightweight), particle size approximately0.1Millimeters, surface sealed and smooth, low thermal conductivity, refractoriness ≥1610°C is an excellent thermal insulation and refractory material, widely used in the production of light-weight castables and in the field of oil drilling. The main chemical composition of the expanded perlite is silicon dioxide and aluminum oxide, featuring fine particles, hollow structure, light weight, high strength, wear resistance, high-temperature resistance, thermal insulation, and flame-retardant insulation. It is one of the raw materials extensively used in the refractory industry.