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Depth filter cartridge type “CX”

The depth filter cartridge type “CX” is the premium product among the melt blown filter cartridges. Only precisely defined microfibers from a special formulation of bi-components are used in the melt blown process for manufacturing these 3D absolute filters. 

The special quality of this process means that the depth filter cartridges type “CX” are especially suitable for customers with very high purity requirements, e.g. in the food industry, for manufacturers of high quality paints and varnishes and for the production of very thin layers on PCBs or the like.


General information/design

Under strictly controlled conditions, the microfibers are applied individually to a rotating shaft in the melt blown process, using a strong air flow from a nozzle. This special process ensures particularly uniform microfibers with regard to length and diameter, which becomes even more evident when viewed under magnification.

The melt blown process runs most efficiently when bi-component fibers of the depth filter cartridges of type “CX” are used.

Following the extraction step, each polypropylene fiber behind the spinneret is coated in an extremely thin layer of polyethylene using a highly engineered procedure. This layer acts as a melting layer and adds a particular set of properties to the type “CX” depth filter cartridge. The mechanical strength thereby achieved is so great that the type “CX” cartridge filters require no support cores. The pore structure is maintained, even under pressure, ensuring that the filtration effect remains reliable and constant.

Since the small amount of polyethylene is perfectly sufficient as a fluxing agent, no additional chemical additives are required for these bi-component fibers.

The high-precision production technology ensures that two perfectly uniform, homogeneous layers of microfiber with an absolute filter efficiency and a particularly long service life are created. This two-layer design can easily be perceived with the naked eye: the first layer is significantly coarser than the second layer, and filters the larger particles. This prefilter in turn protects the finer layer, which contributes to a much longer service life of the type “CX” depth filter cartridges.

The melt blown technology ensures that the product quality of the filtrate is maintained; the filter efficiency thereby achieved is important for generating an extremely pure, particle-free filtrate for sophisticated application scenarios, such as used in the coating industry or for food production.


The depth filter cartridges type “CX” are fully suitable for contact with food. All components comply with the regulations from the Food and Drug Administration (FDA).

RoHS requirements are met for use in the electronics and coating industry.

No substances that could interfere with adhesion, e.g. silicones, are permitted in paint coating systems, among others. All requirements in this regard are also met.


Depending on the cartridge housing, different adapters are available for the depth filter cartridges type “CX”. The adapters consist of polypropylene caps which are attached with a polypropylene melt. 
Different seals made of EPDM, Viton®, silicone®, NBR and other materials are available for the polypropylene caps.

Technical data

Technical dataDepth filter cartridges type “CX”
Medium materialBi-components made of polypropylene and polyethylene
Filter grades (standard)0,5 µm – 100 µm
Length of filter cartridges (standard)250 mm, 500 mm, 750 mm, 1000 mm
Inner diameterapprox. 30 mm
Outer diameter66 mm
Max. temperatureMax. 80 °C for water under static conditions
Application examplesFood and beverage industry, PCB manufacturers, paint and varnish manufacturers

Recommended filter cartridge exchange at max. 2 bar differential pressure.

Filter cartridge product range

String-wound filter cartridges

Putsch® offers a very large selection of string-wound filter cartridges in many sizes, designs, materials and winding patterns.

Depth filter cartridges type “HP”

The depth filter cartridges type “HP” from Putsch® are special depth filters on polypropylene basis which are known for their particularly long useful life.

Depth filter cartridges type “CX”

The depth filter cartridge type “CX” is a 3D absolute filter for customers with very high cleanliness requirements.

Pleated depth filter cartridges type “K11”

The Putsch® depth filter cartridges type “K11” with their micro-polypropylene filter matrix are known to be particularly effective and are especially suitable for filtering out ultrafine particles.

Membrane filter cartridges type “K01”

Putsch® membrane filter cartridges “K01” use a polyethersulfone membrane, filter finest particles down to bacteria and have special adsorption properties.

Mesh filter cartridges type “PGP”

The mesh filter cartridge type “PGP” is a versatile, reusable filter cartridge made from polypropylene mesh. It is easy to clean and can quickly be converted.

Metal mesh filter cartridges type “MGG” + MGP”

Putsch® metal mesh filter cartridges type “MGG” + MGP” are special stainless steel cartridge filters for operation at high temperatures or with specific chemicals.

Activated carbon filter cartridges type “PA-G”

Putsch® activated carbon filter cartridges type “PA-G” are equipped with steam-activated coal pellets and specially designed for strongly contaminated liquids. The bulk form means that the activated carbon surface cannot become blocked by coarse dirt, making the useful life extremely long.

Activated carbon filter cartridges type “EPS”

Putsch® activated carbon filter cartridges type “EPS” are manufactured with activated coconut coal. The activated carbon block has a homogeneous layer with constant adsorption properties. In addition to applications in liquids, these filter cartridges are also suitable for air and gas purification.

Activated carbon filter cartridges type “GAC”

Putsch® activated carbon filter cartridges type “GAC” are made with activated coconut coal granulate and designed for low dynamic pressure and therefore a long useful life. The special design allows the liquid to pass through the entire filling, so the long contact times increase the adsorption effect.

Filter cartridges type “Pro”

Putsch® filter cartridges type “PRO” are cartridge filters on the basis of phenolic resin-bound acrylic fibers, designed for the special requirements of paint and varnish filtration.

Customer Service Center

Use our extensive range of services for solid/liquid separation. Your contact can help you with any questions and problems.

Please send any inquiry and order to

Customer Service Center

Christina Hölper
Phone: +49 (0) 23 31 / 3 99 1 53
Florian Ollesch

Customer Service Center

Phone: +49 (0) 23 31 / 3 99 – 1 50

Emergency number

If you need to contact us in emergencies outside office hours, the responsible Putsch® employee will be informed immediately and the required measures for solving your problem will be initiated.

Phone: +49 (0) 23 31 / 3 99 – 0

Related products:

Cartridge housings type “4”

Cartridge housings type “4” are robust stainless steel filter housings which are modular and accordingly versatile.

Cartridge housings type “6”

Cartridge housings type “6” have been used widely in all industries for over 40 years and are particularly popular due to their solid, robust quality.

Polypropylene Cartridge housings

Housings type “SM”, “SL” and “PN” are polypropylene cartridge housings for use as water filters, each with individual filter cartridges. Their low weight makes them ideal for mobile use.

Cartridge housings type “D-PP”

The customized cartridge housings type “D-PP” are made of polypropylene and are used wherever comparable metal housings are unsuitable, e.g. in an environment containing salt.