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99% Al2O3 Industrial Corundum Ceramic Tube /Alumina Ceramic Insulator, Find Details and Price about Alumina Ceramic Insulator Thermocouple Insulating Core from 99% Al2O3 Industrial Corundum Ceramic Tube /Alumina Ceramic Insulator - TANGSHAN CITY KESHUO SPECIAL CERAMICS MAKING CO., LTD.