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You are here: Products  »  Filtermedia  »  Filter cartridges  »  Wound string filter cartridges FKW

Wound string filter cartridges FKW


Often used as the first filtration stage for process water and in cooling water circuits.

String wound filter cartridges FKW are depth-filtration cartridges made from polypropylene and other materials. They are used for keeping water circuits, plates and film-processing equipment clean. Winding a thread around the cartridge core creates a graded pore structure that works to thoroughly filter particles, as larger particles are trapped in the outer layers and smaller ones in the inner layers. Wound-string filter cartridges also allow for high flow rates at low differential pressures.

We offer filter media and cartridge cores in different materials that can be freely combined as well as custom-tailored filter cartridges in the size (length and circumference) you need. Additionally, we can provide adapters that ensure compatibility with all commonly available filter housings.

For which applications are wound-string filter cartridges FKW useful?

Wound-string filter cartridges FKW are particularly suited for standard filtration in water treatment and electroplating with a water temperature of up to 93 °C. In general, the wound string and the polyproplyene core reliably filter acidic, alkaline and watery solutions as well as many organic media. Wound-string filter cartridges FKW offer excellent filtration with little loss of pressure, which is why they are commonly used in power plants.


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Uses for wound-string filter cartridges FKW

  • Water treatment
  • Seawater desalination
  • Condensate treatment
  • Cooling water circuits
  • Process water
  • Photographic chemicals
  • Film processing
  • Cooking oils
  • Solvents
  • Galvanic baths
  • Fats
  • Acids
  • Alkalis
  • Chemical processes

If you are looking for filter cartridges suited for higher temperatures or for use with specific chemicals, check out our wire-cloth filter cartridges FK-MK.

If you would like to learn more about our wound-string filter cartridges, filter cartridges in general or other Schwegmann products, get in touch with us via our website or call us. We are happy to answer all your questions and advise you on other filtration options. We look forward to hearing from you!


Cartridge typeLengthWinding materialSupporting CoreFineness

Technical data

Lengths5"  |  9 ¾"  |  10"  |  19 ½"  |  20"  |  29 ¼"  |  30"  |  39"  |  40"
DiameterOD: 62 mm I ID: 28 mm
Filter fineness (micron, normal)0,5  |  1  |  3  |  5  |  10  |  25  |  50  |  75  |  100  |  150  |  200
Winding materialP = Polypropylene| W = Polypropylene, washed
H = Glass fibres I    B = Cotton
PE = Polyester | N = Polyamide
Supporting core materialP = Polypropylene | S = Stainless steel
Maximum differential pressure2.5 bar at 30°C
Initial differential pressure0,1 bar
Maximum operating temperature80°C for polypropylene | 135°C for polyamide
150°C for polyester | 150°C for cotton
400°C for glass fibres | 400°C for stainless steel

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