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This is what labs use to measure particle size

To measure particle size in a slurry or powder you need sieves. This is the most popular type used in labs. They are made from brass by a company named Tyler. The range of screen sizes for testing particle size is very wide (obvious here: the top screen has an opening of 56 mm, the bottom one 0.1 mm - the wires are almost too small to see). You can often buy these used on Ebay for a lot less than new ones, search for "tyler sieve". The finer sieves (especially 200) are fragile and more easily ripped. It is good to have a 50, 100 and 150.

Two example of high quality brass laboratory sieves

Links

Tests Sieve Analysis Dry
A measure of particle size distribution by vibrating a powdered sample through a series of successively finer sieves
Tests Sieve Analysis Wet
A measure of particle size distribution by washing a powdered or slaked sample through a series of successively finer sieves
Tests Sieve Analysis 35-325 Wet
A measure of particle size distribution by washing a powdered or slaked sample through a series of successively finer sieves
Tests Wet Sieve Residue
Glossary Particle Size Distribution
Knowing the distribution of particle sizes in a ceramic material is often very important in assessing its function and suitability for an application.
Glossary Ultimate Particles
Utlimate particles of ceramic materials are finer than can be measured even on a 325 mesh screen. These particles are the key players in the physical presence of the material.
Glossary 325 mesh
325 mesh (a sieve with 325 wires/inch) is the finest particle size that most ceramic minerals can be practically processed to (premium grades).
Glossary Sieve
Sieves are important in ceramics for removing particulates and agglomerates from glaze, engobe and body slurries.
Glossary Sieve Shaker
Glossary Particle Sizes
Articles Particle Size Distribution of Ceramic Powders
Understanding the theory behind sieve selection, how to properly sample a powder and how to carry out a particle size distribution test can give you valuable information about a material.

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