IS 5258 : 1969 Determination of particle size of powders by optical microscope method

1 Scope

1.1 This standard describes the optical microscope method fordetermining the particle size of powders which pass through a75-micron IS Sieve IS 460 : 1962 as far as the particle shape andrefractive index will permit. The method of measurement is soarranged that the size analyses of the particles, in microns, areexpressed in the form of a consecutive 2 series,namely 75, 53, 37, 27, 19, 13, 9.4, 6.6, 4.7, 3.3, 2.3, 1.7, 1.2,0.8, 0.6.

1.2 The size distribution is expressed either by number or byvolume or weight and in terms of the diameters of circles havingthe same projected areas as the particles: The method is normallyused for particles having projected diameters in the range 0.6-75microns but the upper size limit can be extended to measureparticles up to 150 microns.

2 References

IS 2 :1960 Rules for rounding offnumerical values

IS 460 : 1962 Specification for test sieves

IS 4124 : 1967Glossary of terms relating to powders

IS 4879 : 1968Methods of Sub-division of gross sample of powder usedfor determination of particle size

IS 5257 : 1969Specification for eyepiece and screen graticules for thedetermination of the particle size of powders