Depth filters made from a continuous fibre yarn wound around the core support


The filter cartridges consist of a continuous fibre yarn, which is wound around a fixed core support. This resulting yarn-structure forms the filter layer with a corresponding layer-thickness and depth-filter effect. Due to the use of various wondering techniques, different thickness of yarn and tractive force during winding, the filter cartridges can be produced with a variety of fine filter rations. Generally speaking, filter cartridges can be manufactured from all available materials in regard to yarn and core, in which the combination of a polypropylene yarn and polypropylene core in WPP filter cartridges has demonstrated the best results in the filtration application of aqueous mediums, acids, lyes and fine chemicals.

The yarn/core-combination of the WBW filter cartridge made of cotton on a stainless steel core is, in comparison, mainly used to filter solvents or cooling water condensate; in other words they are applied where technical operational requirements such as chemical resistance or temperatures > 90 ̊C exclude the use of polypropylene filter cartridges. Filter cartridges made of other materials such as glass fibre, polyester or nylon can be delivered custom-made on request.

Technical Data

Material WPP

Polypropylene with core support made of polypropylene

Material WBW

Cotton with core support made of stainless steel

Filter ration

1 μm to 200 μm


WPP: max. 90 ̊C
WBW: max. 120°C

Differential pressure

Max. 2.5 bar


Internal diameter: 28 mm
External diameter: 62 mm
Length: 4 7/8“ – 40“

Adapter configurations

DOE: without adapter
Code 3F: 222/Flat
Code 8S: 222/Fin
Code 7S: 226/Fin

O-ring material for adapter

NBR = Standard, optional
EPDM, Silicone, Viton
Viton FEP-encapsulated

Features and Benefits

  • 1 μm to 200 μm micron rating
  • FDA-tested polypropylene material
  • Lengths of 4 7/8“ – 40“
  • PP yarn also in washed version
  • Various yarn/core materials
  • All current adapter types deliverable
  • High flow rates, low differential pressures


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