Jewelry sand is a kind of other metal alloy products. Casting-grade pearl sand (particle size 10 mesh -300 mesh) is made of high-quality bauxite, remelted and smelted, and then blown into spherical shape, with sphericity >: 95% and roundness >; 95%, fire resistance >; 1800℃, strength >; 65MP, with high surface finish and good air permeability, is a new casting material for precision casting, coated sand and self-hardening sand. Zhu Bao sand has been systematically applied to EPC production. Sand is artificial bead sand, neutral and fire-resistant at 2000℃.