This International Standard describes methods for calculating and reporting the Al2O3 content of smeltergrade alumina, on either a dry or ignited basis, from the results of the determinations in accordance with ISO 806 and AS 2879.7. NOTE Typical values of a smelter-grade alumina, if reported on a dry basis, would be in the range of 98,5 % to 98,9 % and, if reported on an ignited basis, would be in the range of 99,4 % to 99,7 % mass fraction.