Surface filtration with KemTex® ePTFE membrane filters


Only particles that have not penetrated the filter medium can be cleaned off again. Therefore their separation is necessary on the filter surface at this stage.

This is optimally achieved by our thin KemTex® ePTFE membrane. It has a unique microstructure of billions of randomly arranged pores. The membrane is supported by a polyester fibre fleece on which it is thermally bonded.

Due to the finest fibres and pores of the KemTex® ePTFE membrane, even particles down to about 100 nanometres are effectively separated. Thus an effective surface filtration and with good cleanability is achieved.

Optimal for welding and cutting
Within the framework of the WELDOX study, which was carried out in cooperation with employers' liability insurance associations and the German Institute for Occupational Safety and Health of the DGUV (IFA), measurements of the particle sizes of welding fumes were carried out in 33 companies.

The median value of the particle size of welding fumes was between 20 and 180 nanometres. Particularly fine particles, on average around 20 - 70 nm, were found in TIG welding. In MAG and MIG welding processes, the median value was between 40 and 200 nm.

In the welding fume plume, between 100,000 and 200,000 particles per cm³ were counted. This means that welding fume particles are generally alveolar and the limit values for the A-dust fraction apply. The finest particles can also penetrate cell walls and spread throughout the body via the bloodstream. This is why a high degree of separation is so important even against the finest particles such as welding fumes.


Filter cartridges


  • Large pleat distance while having the same filter area per cartridge 
  • Flexible filter pleats support filter cleaning
  • Even and gentle cleaning using rotating nozzle 
  • Vertical installation in filter systems


  • Less choking up of the filter pleats due to larger distance between pleats
  • Very long service life of the filter elements and rotating nozzles 
  • Cost savings through optimal cleaning properties 
  • Less dust deposition due to being vertically installed

Automatic cleaning

  • Pressure-controlled breath-responsive cleaning by compressed air 
  • A blast of compressed air from the integrated compressed air tank sets the rotating nozzle in motion
  • The rotational movement of the rotating nozzle creates an even flow
  • This achieves optimal cleaning performance of the KemTex® ePTFE filter cartridge

Ideal for welding and cutting

Study by the AWS (American Welding Society) on particle distribution:

  • 98.9% of the dust particles generated are smaller than 400 nanometres
  • Ultrafine nanoparticles can penetrate into human cells
  • KemTex ePTFE membrane filters already have high separation in the nanoscale range

>> Welding Fume Extraction Unit WeldFil 
>> Welding Smoke Extraction Unit WeldFil Compact

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