Sieve Analysis Dry - SADR
This test procedure was employed in the Foresight Ceramic Database and now is available for those having an account at Insight-Live.com. Accumulating test data using the variables defined in these procedures enables us to create tools that enable you to compare the physical properties of materials and recipes.
A set of numbers representing the percentage of dry material particles retained on each sieve in a stack of interlocked sieves with successively finer openings. The stack of sieves is vibrated in a shaker until all material has filtered down through. The test should specify maximum water content of powder, shaking time, settings for shaker (if appropriate), and what sieve series was used (i.e. US Standard, Tyler). Should also specify whether numbers refer to % on the sieve or % passing the sieve.
VAL - Value (V)
Large particle grogs are difficult to produce
These particles are from a grog that has been milled and separated into its constituent sizes in the lab. As you can see it has a wide range of particle sizes, from 48 to finer than 200 mesh. When fired ceramic (like bricks) is ground the finer sizes often predominate. Because the coarser grades have a lower yield they can be much more expensive and harder to get. But they are the most effective in reducing the drying shrinkage and fired stability of structural and sculptural bodies.
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 screen sizes for testing particle size is very wide. The top screen has an opening of 56 mm (that size and smaller pieces can fall through). The bottom sieve has an opening of 0.1 mm, the wires are almost too small to see. Coarser and finer sieves are available. You can buy these on ebay for a lot less than new ones, just search for tyler sieves. Keep in mind that the finer sieves (especially 325) are fragile and easily ripped. We use a series that bottoms out at 200.
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