NON-METALLURGIC ALUMINA; NAMELY ALUMINA NOT USED FOR THE MANUFACTURE OF ALUMINIUM BUT USED IN FRITTED CERAMICS, REFRACTORY PRODUCTS (CONCRETE, CEMENTS, FIBRES, AND BRICKS), NON-INFLAMMABLE PRODUCTS, ACQUEOUS SALTS PRODUCTS FOR ABRASION, POLISHING; SPECIAL ALUMINA FOR THE MANUFACTURE OF SPARK PLUGS FOR MOTORS, FOR CERAMICS, CEMENTS, CORUNDUMS, COSMETICS, NON-INFLAMMABLE PRODUCTS, POLYMERS, REFRACTORY PRODUCTS, ACQUEOUS SALTS, ZEOLITES FOR THE MINERALIZATION OF TATANIUM OXIDE, AND FOR POLISHING...