All filter elements conform to the latest ISO standards. There are a number of ISO quality standards that are applicable to filtration, including:
- ISO 2941 — Collapse and burst resistance
- ISO 2942 — Fabrication and integrity testing
- ISO 2943 — Material compatibility with fluids
- ISO 3723 — Method for end load test
- ISO 3724 — Flow fatigue characteristics
- ISO 3968 — Pressure drop vs. flow rate ISO 16889 — Multi-pass method evaluating filtration performance of filter elements Note: ISO standard 16889 (updated from ISO 4572) provides a common format to rate liquid filter performance. It allows for comparison of published filter Beta ratios, rather than relying on micron ratings. The chart below provides a particle size comparison of the more recent ISO 16889 standard with the old ISO 4572 standard.
|Bx(c)=1000 (ISO 16889)||2.5||5||7||12||22|
|Bx=200 (ISO 4572)||<1||3||6||12||25|
There are a number of ISO target cleanliness codes that can be used to help when designing your system. Conditions that include cold starting, high levels of shock and vibration, if the component can affect safety and/or reliability, or any other severe operating conditions or combination of conditions should be part of your design criteria when selecting the proper filters.
The NFPA (National Fluid Power Association) also publishes several standards applicable to filtration elements which are available on their website.
Computer-aided analysis and measuring methods, the availability of all required test stands according to the ISO - test standards as well as the continuous production control of the filter elements enable INTERNORMEN Technology to be one of the world-leading manufacturers of filter elements at present.
We produce different types of filter elements which are constructed and produced at our factory. Our elements are distinguished by a very high dirt hold capacity and a high pressure resistance which guarantee a long life time.
The beta ratio of the filter element and its permanent efficiency are guaranteed for high pressure differences. Filter materials, bonding and processing are regularly controlled by means of bubble-point tests on our test stand according to ISO 2942.
Filter elements can be supplied with 100% bubble-point tests and corresponding certificates on request. The fiberglass material "VG" used in filter elements for fine filtration is supported by a support fleece and a stainless steel wire mesh and thereby protected against damage during production and later during filtration at high pressure differences.
The bonding of the filter material to the end caps and the seam is executed with maximum accuracy.
By using of special high quality adhesives, a homogeneous connection of the parts is achieved.