Popularity beadIt is a floating fly ash hollow sphere, with a grayish white color, thin walls and hollow structure, extremely light in weight, and a specific gravity of720kg/m3(Heavy-duty)418.8kg/m3(Lightweight), particle size approximately0.1Millimeters, surface sealed and smooth, low thermal conductivity, fire resistance ≥1610℃, a superior thermal insulation and refractory material, is widely used in the production of lightweight castables and in oil drilling. The main chemical components of the expanded perlite are 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.