Absorption removal

Absorption RemovalÂ

Typically, most filter media will absorb a small amount of moisture from the oil, resulting in swelling of the media. This is particularly true for cellulose-based media. In fact, examination of used filters will often indicate if the presence of water is a concern.

Some filter cartridges with an additional wrap consisting of polymer and desiccants are available.

These filters are specifically designed to remove water by absorption and remove both emulsified and free water, as well as solids. However, the elements typically have a limited volume capacity and are best fitted to a portable filter cart for minor water ingression problems.

In fact, when a small gearbox is being fitted with an expansion chamber type breather, it is worthwhile to filter the gearbox with a water-removing element to remove any trace elements of moisture that may condense out on surfaces within the unit when it cools.

The main disadvantage of absorption removal is that it has a limited capability for water removal per element. The positive aspect is not just its ability to trap solids, but also that it is a relatively cost-effective means of dealing with small systems that require polishing to remove moisture.

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