What Are Some Common Filter Media Types

Filters are made in a number of materials, sometimes in combination with one another. Let’s take a look at some of the most common types of hydraulic filter media.

Cellulose

Cellulose is a widely abundant organic polymer that’s sourced mainly from wood pulp and cotton, and is relatively inexpensive to produce. However, its lack of uniform pore structure gives it a nominal rating, which can make cellulose filters susceptible to deterioration and shedding. While cellulose can capture particles, it’s less effective in retaining them, which along with shedding can lead to damage in industrial systems.

Glass

Glass media has a uniform pore structure, which gives it the ability to capture and contain more particles than cellulose. It’s not susceptible to structural manipulation, and it is immune from shedding, so that dirt stays where it is. For this reason, glass filters are awarded absolute ratings, and are considered an upgrade to systems that have been running on cellulose filters.

Wire Mesh

Made from stainless steel, wire mesh filter media have absolute ratings, however it is more durable than cellulose, and more capable of containing particulate. Wire mesh filters are ideal for fire-resistant fluid applications, such as high temperature governor controls, steel mill hydraulics and aircraft ground support equipment.