Alumina bubble is a hollow spherulitic heat-insulation materials, which is made by electro fusing method. It features in light-weight, heat-resistance, and close pore.

Yuli recycled bubble alumina is produced by recycled raw materials, the melting point is only 1650℃，but it is environmental-friendly products.

YuLi low NaO alumina bubble is hard but friable with respect to its pressure strength. The melting point is around 2100℃。 Due to its hollow spheres, YuLi bub