BeadsIt is a fly ash hollow sphere that floats on water, with a grayish-white color, thin walls, and a hollow interior, weighing very lightly, with a bulk density of720kg/m3(Heavy-duty)418.8kg/m3(Lightweight), particle size approximately0.1Millimeters in diameter, surface is sealed and smooth, with low thermal conductivity and 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 composition of 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.