FAQ – Industrial Filtration

The lifespan depends on operating conditions, but generally varies between 6 months and several years depending on the environment, temperature, nature of dust and cleaning frequency. Good preventive maintenance can significantly extend this duration.

Air filtration concerns gases and dust — it uses filter bags, filter panels or cartridges. Liquid filtration concerns the separation of particles in industrial liquids via filter bags, cloths or special media. The media and selection criteria differ depending on the filtered phase.

Cement plants mainly use <strong>filter bags</strong> (PPS, aramid or PTFE membrane) combined with reinforced metal cages and pulse jet cleaning systems to capture fine dust. Temperatures can reach 280°C, so media selection is critical.

The main filter media are:

• Polyester — general use, temperatures up to 130°C
• PPS — chemical and thermal resistance (up to 190°C)
• Aramid — high temperature (up to 200°C)
• PTFE membrane — maximum efficiency, aggressive environments
• Nylon & technical fabrics — liquid filtration

The choice depends on several key factors: the <strong>temperature</strong> of the gas or liquid, the <strong>chemical nature</strong> of the particles, <strong>ATEX constraints</strong> (explosive areas), the required emission level and the maintenance budget. Our technical team carries out a personalized study for each installation.

F4T manufactures filter bags in eight media, from 90 °C to 260 °C in continuous service: Polypropylene (PP): 90 °C continuous, 100 °C peak · Acrylic homopolymer (HA): 125 °C continuous, 135 °C peak · Polyester (PE): 140 °C continuous, 160 °C peak · Polyphenylene sulfide (PS): 190 °C continuous, 210 °C peak · Meta-aramid (MA): 200 °C continuous, 220 °C peak · Polyimide (PI): 220 °C continuous, 240 °C peak · Polytetrafluoroethylene (TF): 240 °C continuous, 260 °C peak · Fiberglass (GL): 260 °C continuous, 300 °C peak.

The flame-resistant media are: Polypropylene (PP), Acrylic homopolymer (HA), Polyester (PE), Polyphenylene sulfide (PS).

Against acids, F4T rates its media as follows: Polypropylene — Excellent · Acrylic homopolymer — Good · Polyester — Good · Polyphenylene sulfide — Good · Meta-aramid — Acceptable · Polyimide — Good · Polytetrafluoroethylene — Excellent · Fiberglass — Good. Polytetrafluoroethylene is the only medium rated “Excellent” across all five families of chemical agents.

These four media cover the upper temperature range: Polyester: 140/160 °C — acids Good, alkalis Acceptable, hydrolysis Poor · Polyphenylene sulfide: 190/210 °C — acids Good, alkalis Good, hydrolysis Excellent · Meta-aramid: 200/220 °C — acids Acceptable, alkalis Acceptable, hydrolysis Acceptable · Polytetrafluoroethylene: 240/260 °C — acids Excellent, alkalis Excellent, hydrolysis Excellent.

Filter bags are an essential component of industrial filtration systems. They ensure efficient dust separation, protect the environment against harmful emissions and optimize process performance in many industrial sectors.

Filter bags are an essential component of industrial filtration systems. They ensure efficient dust separation, protect the environment against harmful emissions and optimize process performance in many industrial sectors. <b>Filter pockets</b> are essential components of <b>industrial dust collection</b> systems. They efficiently capture solid particles present in gas streams from industrial processes. Thanks to their large filtering surface, pockets ensure excellent dust retention while maintaining optimal operating flow in installations. They help improve dust collection efficiency, protect industrial equipment, and reduce particle emissions into the environment.

Metal cages are structures designed to ensure the support and stability of filter bags in industrial dust collection systems. They maintain the bag's shape during operation and help improve filtration efficiency and bag lifespan. F4T offers a complete range of metal cages and accessories for filter bag installation, such as Venturis and caps.

An F4T cage is defined by five parameters: Number of rods, Wire diameter, Ring spacing, Cage length, Integrated Venturis for optimal pulse-jet cleaning.

Three materials: Stainless Steel 304 L, Stainless Steel 316 L, Galvanized Steel. F4T metal cages are made from high-quality materials to guarantee strength, durability and corrosion resistance. Available in:

F4T offers six treatments: Calendering — Facilitates cleaning (dust release) · Singeing — Increases abrasion resistance · PTFE Membrane — Reduces fine dust emissions · Hydrophobic and/or oleophobic — Increases resistance to acids and alkalis · Antistatic — Prevents explosion risks · Flame retardant — Protection against incandescent particles.

PTFE Membrane — Reduces fine dust emissions. Calendering — Facilitates cleaning (dust release).

Antistatic — Prevents explosion risks. Flame retardant — Protection against incandescent particles.

F4T offers five fixing systems: Metal ring, Double Snap Ring bead, Collar, Snap Ring gasket, Double Snap Ring gasket. These fixing solutions guarantee optimal adaptation to tube sheets and different industrial filtration systems.

Our solutions are used in five major sectors: Energy: power plants, thermal power plants, heating units, incineration plants · Building materials: cement plants, lime units, mineral wool production, coating plants (asphalt), glassworks, etc. · Metallurgy: steelworks, production of steel, aluminum, copper, titanium and other metals · Chemical industry: production of carbon black, soda, fertilizers, ammonia and other chemicals · Food and pharmaceutical industry: flour production, powdered milk, pharmaceutical products, etc..