Bubble BeadsIt is a lightweight, hollow fly ash sphere that floats on water, with a grayish-white color, thin walls, and a very light specific gravity.720kg/m3Heavy-duty418.8kg/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 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.