The alumina bubble produced by the company is a hollow spherulitic heat-insulating meterial,which is made by electrofused method.It is noted for its light-weight,heat-resistance,close pore.It is an ideal filler for high-temperatuerfurnaces and excellent aggregate of light weight castable refractory.it is also and ideal heat-insulating and energy-saving refractory. The grain size is 0.25-1mm, 1-3mm, 3-5mm, 0.25-5mm

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