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Single Layer Nominal Filter Bags

Polypropylene (PP) Felt Single Layer Nominal Filter Bags

Polypropylene (PP) felt single-layer nominal filter bags are cost-effective, depth filtration media designed for removing particulate and sediment from liquids. The needle-punched PP felt provides graded density filtration, trapping both coarse and fine contaminants throughout the depth of the media. These bags are widely used for general-purpose liquid filtration across diverse industrial applications due to their broad chemical compatibility, low cost, and ease of replacement.

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Operation

Liquid enters the filter housing and flows from the inside to the outside of the filter bag. Contaminants are trapped within the felt fibers and on the bag surface. The clean filtrate exits through the housing outlet. Bags are disposable but can be rinsed and reused in certain non-critical applications.

  • Single-layer needle-punched polypropylene felt for depth filtration.

  • Nominal filtration ratings from 1 to 200 microns.

  • Broad chemical compatibility – resistant to most acids, alkalis, and organic solvents.

  • High dirt-holding capacity due to depth matrix structure.

  • Lightweight, economical, and easy to install.

  • Welded or sewn seam construction to minimize bypass.

  • Available with multiple ring/collar options for housing compatibility.

  • Standard Sizes:

    • Size #1: Ø7” x 16” length

    • Size #2: Ø7” x 32” length

    • Size #3: Ø4” x 8” length

    • Size #4: Ø4” x 14” length

  • Custom Sizes: Available upon request.

  • Top Sealing Options:

    • Galvanized steel ring

    • Stainless steel ring (SS 304/316)

    • Molded polypropylene flange/ring

    • Polyester ring

  • Seam Construction: Sewn or welded.

  • Material of Construction (MOC): 100% Polypropylene Felt

  • Micron Rating (Nominal): 1 – 200 µm

  • Operating Temperature: Up to 90°C continuous service

  • pH Range: 1 – 14 (broad chemical resistance)

  • Maximum Differential Pressure: 2.5 bar (36 psi) recommended

  • Efficiency: 60–95% (nominal, depending on micron rating)

  • Construction: Single-layer, depth filtration

  • Pre-filtration of process water

  • Removal of gels, rust, and scale in coatings & paints

  • Filtration of coolants, cutting oils, and lubricants

  • Chemical filtration (acids, alkalis, organic solvents)

  • Food & beverage clarification (sugar syrups, edible oils, non-critical fluids)

  • Pre-filtration before membrane or cartridge filters to extend service life

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