Bitwater (Shenzhen) Technology Co., Ltd.’s refractory insulating firebricks exhibit exceptional properties tailored for high-temperature industrial environments. Crafted from vermiculite, these bricks offer low thermal conductivity (0.06–0.2 W/m·K), effectively minimizing heat loss in aluminium electrolytic cells and industrial furnaces while maintaining structural integrity at temperatures exceeding 1000°C. Their lightweight design (400–500 kg/m³ density) eases installation and reduces structural load, yet they resist thermal shock and chemical corrosion from electrolytes or flue gases. With compressive strength exceeding 3.5 MPa and a melting point above 1300°C, these firebricks balance thermal insulation, mechanical durability, and fire resistance to meet the rigorous demands of critical applications.