Particles to be filtered usually fall into one of two categories:
1.Non-deformable particles that under normal conditions (temperatures) do not deform. In some instances, non-deformable particles can become deformable with a temperature or chemistry change—an example of this would is a particle of resin, which at ambient temperatures may be solid, but at elevated temperatures turns liquid.
2. Deformable particles (frequently called gels) that deform when put under pressure. The amount of pressure needed to deform gels varies depending on the specific gel/particle. With deformable particles, if enough pressure is applied, the gel will deform, push out through the filter, and frequently re-agglomerate on the downstream side of the filter. Sometimes, when the particle re-agglomerates, it is larger than could be seen on the upstream side due to coalescence that may have occurred in the filter. In some instances, deformable particles can become non-deformable due to changes in temperature, chemistry, or other conditions.
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