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| BASICS |
| TYPES |
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TESTS |
| FAQ |
| FUAQ |
| What is “Wet sieving”? |
| Wet sieving: Wet sieving involves introduction of aqueous solution of the sample to a testing sieve.
This separates the fines portion of the
sample from the coarse portion of a sample. The liquid medium is used to and negate static charges,
break down agglomerateslubricate near-size particles.
In this method, the sample is weighed and then washed
through the finest sieve in the stack with water, a wetting agent (water
based), or some other compatible solvent. After thoroughly washing the fines
from the raw sample, the residue is dried either over a hot plate or in an
oven. The temperature of the sieve should be maintained below 149°C (300°F ) to
avoid loosening of the sieve cloth or failure of the solder joint. After
drying, the residue is then sieved normally on the balance of the sieve stack.
The loss in weight not accounted for on the coarse screens is assumed to be fines
or soluble material.
Wet sieve analysis is especially helpful when working with naturally agglomerated materials, Ultra-fine powders with severe static changes, and in samples where fine particles tend to cling to the coarse fractions in the blend. The disadvantages associated with wet sieving are primarily the time
period required to perform the analysis due to the additional washing and drying time and the possible damage to the sieve
mesh by overloading. |
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