Porous Metal Filters

GKN’s porous metal solutions excel in a wide variety of demanding applications where other common filter products do not perform sufficiently. We offer the complete range of functional porosity products to complete customer requirements. 

Advanced filtration solutions for demanding applications

  • Innovative customized designs
  • State-of-the-art porous elements
  • Service from Engineering up to aftermarket support

Higher productivity with advanced filter media

Higher productivity with advanced filter media

A chemical manufacturer looked to increase the output of a product line without exchanging the complete filtration system due to cost issues.

GKN engineering recommended the SIKA-R 3 AS metallic membrane to solve the challenge. Compared to conventional filter media, the AS membrane delivers a 20 percent higher flow rate and higher output of the filtration system.

With customized design, cartridges are used as a retrofit in almost any filter vessel. The customer increased productivity while maintaining the existing filter system. This saved the additional costs of vessels, tubesheets, and valves that would have made the project over budget. The SIKA-R 3 AS metallic membrane enabled a quick return of investment for our customer.

Functional porosity

The properties of the final component depend on the choice of raw material. The wide spectrum of alloys, powder sieving, and material structures offers a variety of products and features.
Sintered filter elements are made of stainless steel, bronze, nickel based alloy, titanium and special alloyed powders or stainless steel fibre felt.

All GKN sintered materials offer a self-supporting structure with high mechanical strength. Seamless layout is possible up to 1,600 mm length and 320 mm OD.
We manufacture various filter grades with specified pore sizes and flow rates in order to have the appropriate solution for your requirements.

For each geometry, the GKN Engineering team chooses a pressing technique or gravity sintering without previous compaction. 

The metal powder is filled into the appropriate die and compacted. The pore size of the finished product is controlled, selecting the size of the powder and the compaction pressure used to form the part.

Sintering gives the high porous material the shape stability and property of a strong metal component. The compacted part is sintered in specially designed furnaces. Sintering is the fundamental processing step for all powder metal products. 

It is the process of bonding powder particles by fusing them at temperatures below their melting point. After sintering, regardless of micron size, the separate grain structure of the original powdered metal becomes fully interlinked to form a rigid part.

After years of development, the product offers a sintered membrane that combines high permeability and low pressure drop, while retaining all the advantages of sintered metal filters. The metallic AS (ASymmetric) membrane, a layer of extremely fine metal powder, is applied onto a cartridge of coarser porosity as support structure.

A second sintering process produces an even metal coating of approximately 200 μm thickness bonded to the carrier. Compared to the support, the membrane layer has significantly smaller pore size, so during filtration contaminants are retained on the filter surface. 

Customized design enables GKN filter elements to be used in nearly any new application or as a retrofit in filter systems. The design of sinter-bonded fittings without porous to solid welding seams provides the best corrosion resistance and fatigue strength. 

It is considerably higher when compared to conventional welded constructions. We also manufacture to customer-specified dimensions. Elements larger than our seamless standard types can be welded at our certified in-house welding shop.

Case studies

Porous metal filter materials

Porous metal filter materials

GKN SIKA brand products are available in a range of materials. Tailoring design requirements to individual process requirements is easy with the powder metal solution.

Available materials: Stainless Steel (standard 316L), Hastelloy, Inconel, Monel, Bronze, Titanium, and special alloys on request.

Main properties:

  • Shape stability by self-supporting structure
  • Suitable for high differential pressures
  • Thermal stability up to 950°C
  • High corrosion resistance
  • High permeability and low Dp
  • Defined filtration by exact pore size distribution
  • Filters can be back flushed and cleaned easily
  • Welding and machining are possible

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Christian Nast
Christian Nast
Technical sales
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