Filter Bags & Media Glossary

Filter Bags and Filtration Media Technical Glossary

Complete Industrial Terminology Guide for Filter Bags, Felt Filter Bags, Mesh Filter Bags, Dust Collection Bags, and Industrial Filtration Media Technologies

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Why Industrial Filtration Glossary Matters

Industrial filtration systems involve highly technical terminology that directly impacts system performance, product quality, operational safety, and maintenance planning. A clear understanding of filtration terms such as micron rating, differential pressure, nominal filtration, and absolute filtration is essential for engineers, plant operators, and procurement teams when selecting or maintaining filtration equipment.

In many industries, incorrect interpretation of filtration terminology can lead to improper filter selection, reduced equipment life, higher operational costs, and process contamination risks. A structured industrial filtration glossary helps standardize technical understanding across engineering, operations, purchasing, and maintenance teams, ensuring correct specification and application of filtration systems.

The industrial filtration glossary developed by Praimo Industrial Filters & Spares Manufacturing Company is based on real-world manufacturing knowledge, multi-industry application experience, and practical engineering insights. It serves as a technical reference to support better decision-making in system design, product selection, troubleshooting, and performance optimization.

Key Benefits of Using an Industrial Filtration Glossary

Improves technical understanding of filtration systems and components
Helps select correct filter housings, cartridges, strainers, and filter media
Reduces risk of filtration system failure or process contamination
Supports maintenance and troubleshooting activities
Assists procurement teams in technical product comparison
Enhances cross-team communication using standardized terminology

Filter Bag and Filtration Media Terminology for Liquid Filtration, Air Filtration, and Process Filtration Applications

The Filter Bags and Filtration Media Technical Glossary is an A to Z reference covering terminology used across industrial liquid filtration, air filtration, dust collection filtration, and solid-liquid separation systems including felt filter bags, mesh filter bags, oil-adsorbing filter bags, centrifuge filter bags, FBD and FBP filter bags, and industrial woven and non-woven filtration media.

Filter bags and filtration media are critical to industrial filtration performance and directly influence micron rating efficiency, dirt-holding capacity, pressure drop behavior, flow performance, contaminant capture efficiency, and overall filtration system reliability. This glossary supports process engineers, maintenance teams, and filtration system designers working with industrial liquid filtration, powder recovery systems, and dust collection filtration applications.

The glossary explains essential terminology including depth filtration media, surface filtration media, micron rating selection, differential pressure monitoring, media construction types, chemical compatibility, and filtration efficiency characteristics used in industrial filtration process design and operation.

Industrial Filter Bag and Filtration Media Engineering Knowledge from Praimo Industrial Filters & Spares Manufacturing Company

This glossary is developed using manufacturing and application engineering knowledge from Praimo Industrial Filters & Spares Manufacturing Company.

The company designs and manufactures liquid filter bags, oil-adsorbing filter bags, dust collection bags, FBD and FBP filter bags, centrifuge filter bags, non-woven filtration media, woven filtration media, and high-temperature filtration fabrics for chemical, pharmaceutical, food processing, water treatment, and powder-handling industries.

Engineering Insight Correct selection of filter bag media based on particle size, fluid chemistry, operating temperature, and flow conditions significantly improves filtration efficiency and extends filter bag service life.

Filter Bags and Filtration Media Technical Glossary A to Z Terms

The following section provides alphabetical definitions of industrial filter bag and filtration media terminology used across liquid filtration, air filtration, dust collection, and solid-liquid separation applications.

Glossary Not Found

Filter Bag

A replaceable porous element used to remove solids from liquid or gas streams.

Praimo Engineering Note: Praimo manufactures felt, mesh, and oil-adsorbing filter bags with high dirt-holding capacity and precise stitching for leak-free service.

Felt Filter Bag

Bag made from needled or singed polyester or polypropylene felt for depth-type filtration.

Praimo Engineering Note: Praimo felt bags capture fine particles efficiently and are thermally welded to eliminate fiber migration.

Mesh Filter Bag

Bag made of woven nylon or polyester monofilament fabric providing surface filtration.

Praimo Engineering Note: Praimo mesh bags are ideal for high-flow, low-viscosity applications like inks and cooling water.

Oil-Adsorbing Filter Bag

Bag media treated to adsorb hydrocarbons from process or wastewater streams.

Praimo Engineering Note: Praimo oil-adsorbing bags remove up to 10× their weight in oil, aiding environmental compliance.

Liquid Filter Bag

General term for bags handling liquid phase filtration from 1 µm to 200 µm.

Praimo Engineering Note: Praimo liquid bags are compatible with all standard #1, #2, and #4 bag housings.

FBD Filter Bag

Fluid-bed dryer bag used for powder recovery and air exhaust filtration.

Praimo Engineering Note: Praimo FBD bags are made from anti-static polyester for pharma and food granulation processes.

FBP Filter Bag

Fluid-bed processor bag designed for drying and coating operations.

Praimo Engineering Note: Praimo FBP bags maintain airflow uniformity and dust containment during drying cycles.

Centrifuge Filter Bag

Heavy-duty bag mounted in basket centrifuges for solid-liquid separation.

Praimo Engineering Note: Praimo centrifuge bags are stitched from multi-layer woven fabrics for mechanical stability and easy cake release.

Non-Woven Filter Media

Randomly bonded fiber sheet used for depth filtration and particle retention.

Praimo Engineering Note: Praimo non-woven PP and polyester media provide graded density and high contaminant loading.

Woven Filter Media

Fabric formed by interlacing yarns in a consistent weave pattern for surface filtration.

Praimo Engineering Note: Praimo woven mesh media offer predictable pore size and superior mechanical strength.

Micron Rating

Smallest particle size the bag can retain, expressed in micrometers (µm).

Praimo Engineering Note: Praimo bags are available from 1 µm for fine polishing to 200 µm for coarse clarification.

Ring Collar / Snap Ring

Rigid collar welded or sewn to the bag mouth for sealing in the housing.

Praimo Engineering Note: Praimo uses PP, SS, or galvanized snap rings ensuring positive seal and quick change-out.

Welded-Seam Bag

Bag fabricated by heat-welding instead of stitching to prevent bypass and fiber shedding.

Praimo Engineering Note: Praimo ultrasonic welding ensures clean seams for food and pharmaceutical use.

Sewn-Seam Bag

Traditional stitched bag construction using high-strength threads.

Praimo Engineering Note: Praimo employs double-stitched seams for durable performance in heavy slurry filtration.

Surface Filtration

Process where contaminants are trapped on the surface of media.

Praimo Engineering Note: Praimo mesh bags function on surface filtration principle allowing easy rinsing and reuse.

Depth Filtration

Filtration through the thickness of the media capturing particles within its layers.

Praimo Engineering Note: Praimo felt bags use depth filtration to hold high dirt volumes and extend service life.

Differential Pressure (ΔP)

Pressure drop across the bag indicating clogging or saturation.

Praimo Engineering Note: Replace Praimo bags at 1.5 bar ΔP to maintain flow efficiency.

Cage Support / Basket

Perforated metal insert supporting the filter bag against collapse.

Praimo Engineering Note: Praimo precision-welded baskets ensure uniform flow and prevent bag damage.

Needle-Punched Felt

Fabric produced by mechanically entangling fibers for three-dimensional depth.

Praimo Engineering Note: Praimo uses needle-punched felt to achieve consistent porosity and strength.

Singed Finish

Heat-treated felt surface to minimize fiber release.

Praimo Engineering Note: Praimo singed felts ensure clean filtrate in sensitive applications like coatings and beverages.

Glazed Finish

Calendered felt surface creating a smooth, shiny layer that resists blinding.

Praimo Engineering Note: Praimo glazed felts extend cleaning intervals and reduce clogging in viscous media.

Air-Permeability

Volume of air passing through fabric per unit area, indicating breathability.

Praimo Engineering Note: Praimo measures air-permeability to balance flow resistance and filtration efficiency.

Filter Media Compatibility

Ability of fabric to resist chemical or thermal degradation.

Praimo Engineering Note: Praimo matches media to service conditions—PP for acids, polyester for solvents, PTFE for high-temperature gas.

Dust Collection Bag

Fabric bag capturing fine particulates in baghouse or dust-collector units.

Praimo Engineering Note: Praimo dust bags are stitched from anti-static felt for safe use in powder-handling industries.

Oil-Water Separation Media

Composite media selectively absorbing hydrocarbons while repelling water.

Praimo Engineering Note: Praimo’s oleophilic media improve effluent quality in wastewater treatment.

Filter Sock

Tubular bag used for large-particle or pre-filtering stages.

Praimo Engineering Note: Praimo filter socks offer quick-fit design for basket strainers and sump filters.

High-Temperature Media

Fabric capable of withstanding elevated operating temperatures.

Praimo Engineering Note: Praimo supplies Nomex, PPS, and PTFE media for filtration up to 250 °C.

Bag Retainer Ring

Clamping ring securing the bag inside its support basket.

Praimo Engineering Note: Praimo stainless retainer rings prevent bag displacement during surge flows.

Filtration Efficiency

Percentage of contaminants removed by the bag at specified micron size.

Praimo Engineering Note: Praimo bags achieve 90–99 % nominal efficiency depending on media grade.

Service Life

Operational duration before replacement due to loading or damage.

Praimo Engineering Note: Praimo optimizes media layering and sealing to maximize bag service life in harsh duty.