Popular BeadIt is a light fly ash hollow sphere that floats on water, with a grayish white color, thin-walled and hollow, extremely light, with a bulk density of720kg/m3(Heavy-duty)418.8kg/m3(Lightweight), particle size approximately0.1Millimeters, surface is sealed and smooth, low thermal conductivity, melting point ≥1610℃, an excellent thermal insulation and refractory material, is widely used in the production of lightweight castables and in 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.