This standard covers three methods of air elutriation for quantitative determination of particle size distribution in sub-sieve range. The first method suitable for readily dispersed particles is used for particle size range 5 to 75 microns. The second method is suitable for poorly dispersed particles in the same size range. The third method is suitable for dealing with particles which are difficult to disperse and are in size range of 10 to 75 microns.
IS 4961-1968 history
1969IS 4961-1968 Determination of powder particle size by air elutriation method