At Sintex a/s we are able to offer a range of stainless steel sintered filters manufactured in accordance with customer specifications.
We have developed both sintering processes and our own materials that enable steel sintered filters to be produced with a wide range of properties.
Innovation
Our experience and know-how within the field of powder metallurgy enable us to ensure that the customer’s overall solution is fully optimised.
Our development department maintains the focus on innovation through the development of new qualities of materials and not least through new processes. Both areas are enhanced on an ongoing basis such that the unique properties of the materials are exploited to the full, thus ensuring that the customers’ requirements are always met.
Possibilities
The variation of pore size and carefully controlled pore distribution are utilised to produce filters that feature a wide range of different applications.
Sintered components’ special property in terms of porosity is utilised to produce filters that do not suffer from the same shortcomings as conventional solutions. The sintering process holds the material together so that stainless steel sintered filters are both stronger and better than conventional filters.
Sintered filters have fine tolerances and considerable geometrical possibilities. For instance, it is often possible to reduce the number of subcomponents and processes in the final filter solution, since a number of the subcomponents can be replaced by a single filter that is compressed in a single process. This avoids further time-consuming machining. The method chosen depends on the proposed application of the filter.
The exploitation of the porosity enables the filters to be used for:
- Gas and liquid filtration
- Flow control of gases and liquids
- Flame traps and explosion protection
- Ventilation
Applications
Sintered filters can provide significant benefits within a number of sectors of industry. For example, we supply filters in a material certified for use with drinking water. Sintex® stainless steel sintered filters are used today in both the food and pump industries, in the chemical sector and for analytical purposes.
Pore distribution
Filtration
Flow control
Protection (e.g. flame traps, explosion protection)
Ventilation / Pressure equalization
The process
A filter’s function is primarily determined by the pore size. When the pore size has been established, the rela- tionship between the flow rate, pressure drop and filter area is given.
By varying the size of the powder particles and the density of the material, filters can be produced with dif- ferent pore sizes. Furthermore, by controlling the pore distribution, components featuring different properties can be manufactured.
The compression process makes it possible to obtain a number of different geometries, and the sintering pro- cess ensures that the strength is increased to the point that the filters assume their final properties. The sintered filters can be used as self-supporting structural elements or can make up part of a mechanical construction.
Filter design
Sintex a/s designs a filter element on the basis of pore size and permeability such that it complies with a given specification.
The pore size and the permeability are determined on the basis of the following ISO standards:
- ISO 4003-1994 Permeable Sintered Metal Materials – Determination of Bubble Test Pore Size
- ISO 4022-2006 Permeable Sintered Metal Materials – Determination of Fluid
Filter specification
The specifications of a filter element include:
- Dimensions
- Geometrical tolerances
- Application temperature
- Particles or media to be filtered
- Size and distribution of particles
- Area of application
- Quantity, units per year and units per order
- Filter parameters
A review of the filter’s application and operating conditi- ons – in addition to the filter specifications – provides the best basis for establishing the optimum filter design.
Material and corrosion resistance
At Sintex a/s we are able to offer several types of materi- al ranging from extreme corrosion resistance to standard stainless alloys.
The choice of material type shall of course take place on the basis of the application requirements, and we are always happy to place our expertise at your disposal in this regard.
Please contact us for further information about stainless steel sintered filters.
