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Refractory Heat Resistance Electrical Insulation High 95% 99% Porous Hollow Al2O3 Alumina Ceramic Tube/Rod, Find Details and Price about Al2O3 Ceramic Rod Ceramic Shaft from Refractory Heat Resistance Electrical Insulation High 95% 99% Porous Hollow Al2O3 Alumina Ceramic Tube/Rod - Shanghai Gongtao Ceramics Co., Ltd.