The alumina bubble is a hollow spherulitic heat-insulating material,which is made by electro-melted method.It is noted for its lightweight, heat-resistance, and close pore.

• 氧化铝空心球 ALUMINA BUBBLE 氧化铝空心球是由电熔法制得的空心球状隔热材料 .；它的特点是质轻闭孔耐高温。