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Sieve Analysis Wet - SVWT

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.

Notes

Also called "Sieve Analysis Water Washed".
A set of numbers representing the percentage of material particles retained on each sieve in a stack of interlocked sieves with successively finer openings. The material is slaked and washed through the stack of sieves. Each percentage value should show the screen size. Use this for presentation on data sheets, use the SIEV test if you are managing the measurement and collection of the actual data.

Variables

VAL - Value (V)

This is what labs use to measure particle size

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.

A root-of-two series of test sieves

A root-of-two series of test sieves

The coarsest screen is at the top, the finest on the bottom. The opening for each is shown on the label. They are chosen such that each successive screen going down has an opening that is about half the area of the one above it. Using this series you can produce a practical measurement of the distribution of particle sizes in ceramic materials and bodies used in traditional ceramics (structural products industries, like brick, measure coarser particles than this, starting at perhaps 10 mesh and ending at 70). The 325 screen on the bottom is only used sometimes, it is difficult to finer-that-325 particles to pass through it because it blinds. It is not possible to shake powder through sieves that are this fine, samples must be washed through.

Out Bound Links

In Bound Links

  • (Articles) The Physics of Clay Bodies

    Learn to test your clay bodies and recording the results in an organized way and understanding the purpose of each test and how to relate its results to changes that need to be made in process and recipe.

  • (Tests) P325 - % Passing 325 Mesh Wet
  • (Tests) HEGF - Hegman Fineness
  • (Glossary) Particle Size Distribution

    When minerals and mixtures of minerals are ground into a powder a particle size distribution is produced, that is, populations of particles of various sizes. The relative sizes of these populations can be measured to rationalize the behavior of the powder in the ceramic process. Wide distribution...


By Tony Hansen




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