If you are looking for this standard,you are very luck,because i will share it today and it can be downloaded.
Now i will introduce it.BS ISO 20977:2018,Liming materials — Determination of size distribution by dry and wet sieving.
BS ISO 20977:2018 specifies two methods for the determination of the particle size distribution of liming materials.
The dry sieving of powdered material containing individual particles can be carried out quite easily.This simple, quick and cheap method enables the determination of the particle size of water-soluble materials. Therefore, the dry sieving method should always be used first. However, the sieve apertures can become blocked by sample particles, a phenomenon known as blinding.Blinding is mainly caused by caking and the production of electrostatic charges, particularly on sieves with small apertures. Dry sieving of very wet material can also lead to blinding. These difficulties are not encountered with thewet sieving method, which is applicable to any kind of material such as powders (dry or wet),paste-like products or granules except those containing water-soluble constituents.
In order to ensure the comparability of results, all masses of size fractions are expressed as dry matter.
BS ISO 20977:2018 is based on EN 12948: 2002.