Aluminium oxide primarily used for the production of aluminium. Determination of specific surface area by nitrogen adsorption

Aluminium oxide primarily used for the production of aluminium. Determination of specific surface area by nitrogen adsorption

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1   Scope

This International Standard specifies an instrumental method for the determination of specific surface area (SSA) of smelter-grade alumina (SGA) by nitrogen adsorption by a single- or multi-point method. A multi-point method is recommended due to the higher accuracy obtained; if a single-point method is used, a lower result will be obtained.

NOTE Annex A provides an explanation of the difference between single- and multi-point determined BET SSA.

This International Standard is applicable to aluminas having a surface area between 50 m2/g and 90 m2/g.