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Common Industry Terms V

July 2015

The filtration industry uses industry-recognized terminology to communicate information relative to filters. What type of filter is it? How does it work? What components are included within the filter and what does that tell us? What are the performance levels of the filter itself? These terms help us to understand the characteristics of all filters, regardless of brand.

Here are a few common industry terms relative to filtration.

Filter Element Types

Strainer
This type is limited to the use of screens, either as a single or multiple unit. The materials are non-absorbent and are of a metallic or woven fabric. In some cases, a bulk pack of vegetable fibers is used for a depth type of screening operation.

Depth
This type consists of a bulk or mass of material through which the liquid must flow. The materials used can be of the absorbent or the non-absorbent type or a mixture of both.

Combination Depth
This element consists of several kinds of materials formed with different densities. One material, usually non-absorbent, is used to give fast flow and another absorbent material is used to obtain the maximum of efficiency.

Surface
Treated paper or specified materials is formed to create a large area of surface. The shapes assumed to give large areas of surface are generally of the radial pleat or accordion pleat design.

Filter Media Types

Cellulose
Cellulose fibers, wood based materials, are irregular in shape and size and have the ability to trap small contaminant particles while holding a significant amount of those contaminants.

Cellulose Blends
This media, uses cellulose as a base and adds glass or synthetic fibers to it, to provide other properties to the media.

Layered Blends
Combines layers of cellulose and synthetic medias to increase contaminant removal efficiency and contaminant holding capacity.

Synthetic Blends
Synthetic or blown glass fibers are sandwiched between nylon and polyester. This media may be reinforced with wire or other types of backing. Provides excellent flow properties and less restriction to flow or pressure drop across the media.