New Standard from Last Update.

1. SCOPE

1.1 This standard covers general principles and guidelines for determining the particle size distributions of particulate materials, typically in the size range of 0.5 µm to 100 µm, by gravitational sedimentation in a liquid.

1.2 The methods of determining the particle size distribution described in this standard are applicable to slurries or to particulate materials which can be dispersed in liquids. A positive density difference between the discrete and continuous phases is necessary, although gravitational photo sedimentation can be used for emulsions where the droplets are less dense than the liquid in which they are dispersed. Particles should not undergo any physical or chemical change in the suspending liquid. The usual precautions need to be taken with hazardous material, and explosion proof analysers are required when examining volatile liquids with a low flash point.

2. REFERENCES

The standards given below contain provisions, which through reference in this text, constitute provisions of this standard. At the time of publication, the edition indicated were valid. All standards are subject to revision, and parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent edition of the standard:

IS 33 : 1992 Inorganic pigments and extenders for paints - Methods of sampling and test (third revision)

IS 4124 : 1981 Glossary of terms relating to powders (first revision)

IS 4730 : 1994 Method for determination of density of liquids (first revision)

IS 4879 : 1994 Method of sub-division of gross sample of powder used for determination of particle size

IS 5282 Determination of particle size distribution by gravitational liquid sedimetation methods:

(Part 2) : 2023 Fixed pipette method (first revision)

(Part 3) : 2023 X-ray gravitational technique (first revision)

(Part 4) : 2023 Balance method (first revision)

IS 8883 Methods of sampling:

(Part 1) : 2005 Chemical and chemical product (first revision)

(Part 2) General requirements and precautions Sampling equipment,

(Sec 1) : 1978 For solids

(Sec 2) : 1978 For liquids

(Sec 3) : 1978 For gases

IS 18100 : 2022 Sample preparation –— Dispersing procedures for powders in liquids