Multi-phase sintering hollow spheres using high-quality refractory raw materials, using a unique manufacturing process, after a high-temperature kiln fired made. Sintered hollow body products, is to use a variety of materials of complex multi-phase structure of dense, with an average wall thickness 0.3 ~ 0.5mm, particle size 3 ~ 7mm, the ball's outer surface uneven. The ball and the ball between the chimeric good and effective accumulation of improved performance, thereby reducing the gap between the ball and the ball, thus impeding the convective cooling, it also is a vacuum to be hollow and lower thermal conductivity of the composite structure of , making it to achieve better insulation effect. As the sintered hollow sphere also has a high compressive strength, low consumption, high refractoriness advantages can not be replaced with other insulation materials, excellent performance.