This Standard sets out a method for the determination of loss of mass on heating of aluminium oxide at 300°C and further loss of mass on ignition at 1000°C. By industry convention, these mass losses are often referred to as ‘moisture’ (MOI) and ‘loss on ignition’ (LOI) respectively.This method is suitable for calcined alumina in the range 0.2% to 5% loss of mass at 300°C and 0.1% to 2% loss of mass at 1000°C.This method provides for samples to be treated on an ‘as-received’ basis for determination of actual MOI and LOI in alumina samples. To improve precision of analysis in cases where ‘as-received’ results are not required, samples can be ‘air-equilibrated’ prior to analysis. ‘Air-equilibration’ can greatly affect MOI results and significantly alter LOI results. The ‘air-equilibration’ procedure and its affects are discussed in Appendix A.Instrumental methods are also discussed.