Classification of Filter Media

The list of some of the main types of filter media that are used to keep products clear, consistent and uncontaminated is given below.

Classification of Filter Media

(i) Woven filters: Woven filters include wire screens and fabrics of cotton, wool, and nylon. Wire screens, for example, stainless steel are durable, resistant to plugging, and easily cleaned. Cotton is a common filter, however, Nylon is superior for pharmaceutical use, since it is unaffected by mold, fungus, or bacteria and has negligible absorption properties. A bag filter is a common example of this type. Bag filters come in several different varieties and are best suited for situations where large solids must be removed from a liquid. In this scenario, the liquid would flow through the bag and the solids would get caught inside. Bag filters may be made from a variety of different materials, and are usually available in different lengths and micron ratings to suit whatever job you need them for.

(ii) Non-woven filters: Filter paper is a common example of a non-woven filter medium since it offers controlled porosity, limited absorption characteristics, and low cost. A panel filter is a non-woven type filter. It is an industrial filter that may come in a variety of different shapes and sizes, depending on the application. In the majority of cases, panel filters are plain and are found inside ventilation or air conditioning units.

(iii) Membrane filters: Membrane filters are basic tools for micro-filtration, useful in the preparation of sterile solutions. These filters are made by the casting of various esters of cellulose, or from nylon, Teflon, and polyvinyl chloride. The filter is a thin membrane with millions of pores per square centimeter of filter surface. A cartridge filter is cylindrical, but occasionally it looks flat. Cartridge filters use a barrier/sift method to remove sediment and harmful solids from liquid. Some cartridge filters are designed to remove microscopic elements and some are designed to stop larger particles from getting into the finished product. Membrane filters are cartridge units and are economical and available in pore sizes of 100 µm to even less than 0.2 µm. They can be either surface cartridges or depth-type cartridges. Surface cartridges are corrugated and resin-treated papers used in hydraulic lines.

For example, ceramic cartridges and porcelain filter candles. They can be reused after cleaning. Depth-type cartridges are made-up of cotton, asbestos, or cellulose. These are disposable items since cleaning is not feasible.

(iv) Porous plates: These include perforated metal or rubber plates, natural porous materials such as stone, porcelain or ceramics, and sintered glass. Sintered glass, sintered metal, earthenware, and porous plastics are used for fabrication. These are used for their convenience and effectiveness.

(v) Hydraulic Filters: Hydraulic filters are industrial filters that are designed to purify petroleum-based liquids such as oils. These types of filters are often found in different hydraulic systems to prevent a breakdown caused by oil impurities. Hydraulic filters can also be used to purify water-based liquids.

(vi) Strainers: Strainers often become part of the manufacturing process when the process contains solids that are too large to be caught up in other types of filter media. Strainers consist of baskets that can be removed and cleaned out regularly to prevent them from being stuck inside. Some strainers can be cleaned without interrupting the system, while others cause some disruption each time when they are cleaned.

(vii) Air Filters: Air filters are an important part of most industrial processes, as they remove dust, dirt, and other particles from the air. Most air filters consist of a mesh that catches the particles when air is forced through. If the air is to be protected from gases and odors as well as particles, a high-efficiency particulate air filter is used.

(viii) Gas Filters: Gas filters are a type of industrial filter that helps to remove contaminants or particulates from a dry or liquid gas stream. Depending on the situation, the contaminants may be solid or liquid. Some of the different elements and accessories for gas filters include gas filter separators, coalescers, and gas scrubbers.

Type of filter media, characteristics, and their application

Type of filter media



Metal fiber media (non-woven metal fiber).

Excellent durability, corrosion, and abrasion resistance.

Polymer and gas industry.

Multilayer sintered mesh.

It can be reused.

Gas industry.

Stainless steel (plain, twill, and Dutch type)

Waterproof inside and plastic weaved cloth outside.

Oil, chemical, food, pharmaceutical, and aviation industry.

Anthracite filter media.

It has high efficiency.

Water purification.

Filter media is treated with graphite.

Made up of fiberglass.

Used in cement and steel industry. Used as filter cloth for the air filter.

Activated carbon fabric (non-woven type)

Little air current resistance, strong strength.

Used in an air conditioner as an auto air filter or carbon air filter.

Aramide filter fabric

Easiness of cake peeling, high stability, anti-distortion.

Used in one dressing, chemical, and brewing industry, equipped in filter presses, vacuum filters, etc.

Autoroll filter media

It has a metal structure, saves energy, and works stably.

Used in air filtrate.

Air filter

Pocket type of filter.

Air conditioning and electronic industry, food industry, applied to the pre-filtration of coarse efficiency.


Make sure you also check our other amazing article on : Factors Affecting Filtration

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