... Specification is complete, easy to use ceramic fiber plugThis series of products are processed by adopting high ... for heat insulation sealing,also used in metallurgy, mechanical, electrical, ceramic, glass, construction industry for thermal insulation . Shut off sleeve used ... in aluminum smelting furnace, static furnace,etc. Color: White Composition: AL2O3: 46% SiO2: 53.5% Fe2O3: 0.1% Impurity: 0.1 ...