 But there are some applications which can only be carried out by wet sieving.This is the case when the sample which has to be analysed is e.g.a suspension which must not be dried; or when the sample is a very fine powder which tends to agglomerate (mostly < 45 µm) – in a dry sieving process this tendency would lead to a clogging of the sieve meshes and this would make a further sieving process impossible.