IS 5421:1981 is the Indian Standard (BIS) for glossary of terms relating to testing sieves and test sieving. This standard provides a glossary of standardized terms relating to testing sieves and test sieving procedures. It ensures uniformity in terminology across different disciplines performing particle size analysis, material grading, and quality control of granular materials.
Glossary of terms relating to testing sieves and test sieving
| Parameter | IS Value | International | Source |
|---|---|---|---|
| Definition of 'Aperture' | The distance between two adjacent parallel wires. | distance between two adjacent warp or weft wires, measured in the projection plane of the wire cloth at mid-position | ISO 2194:2020 |
| Definition of 'Test Sieve' | A sieve intended for the particle size analysis of a material. | device for testing with one or more sieving media, mounted in a frame | ISO 2194:2020 |
| Definition of 'Blinding' | The condition where the apertures of the sieving medium are blocked by particles of the material being sieved. | reduction of the open screening area as a result of the apertures becoming blocked with near-size particles or being coated with fine material | ISO 2194:2020 |
| Definition of 'Nesting Sieves' | A set of sieves so constructed that they may be fitted together. | set of test sieves with the same nominal diameter, so they can be assembled into a stack | ISO 2194:2020 |
| Definition of 'Sieving Medium' | A surface provided with apertures of specified shape and size. | part of a screening machine on which the size separation is carried out (also termed sieving surface) | ISO 2194:2020 |
| Definition of 'Nominal Wire Diameter' | The diameter of the wire specified for weaving the wire cloth. | diameter of a round wire before weaving | ISO 2194:2020 |