Through various additional finishes we are able to adapt all needlefelts to any specific



All needlefelts at KAYSER are heat-set. the residual shrinkage is reduced to a minimum by means of an optimum

combination of the decisive quality factors, such as temperature, dwell time and cooling phase. The controlled process management during the cooling phase ensures that the filter bags will have excellent form stability even under most difficult conditions.


The surface of any needlefelt influences the structure of the dust cake, its cleanability as well as pressure drop and emissions.



Three different kinds of treatment are possible. “Smooth”, for adhesive and moist dust, “Medium”, for universal treatments and “rough”, for low agglomeration or fine dust.


Through calendering a more compact fiber structure is achieved. this allows a more surface-active separation of dust with lower emissions.

Protective impregnation


this treatment makes it more difficult for moisture to penetrate into the needlefelt. thus the risk of excessive dustdeposits and caking is reduced.

Protection AgAinst Acids & hydrolysis

Special impregnation based on Teflon ®. this treatment coats the fiber surface, providing it with the antiadhesive character of a PTFE finish. An oil- and water-repelling effect is produced, and the fibers are effectively protected against acid and hydrolysis attack.

Active finish, hydrophobic

Special water-repellent treatment providing a high cleaning and separation efficiency.

Spark Protection


These special treatments prevent glowing particles from direct contact with the needlefelt. This allows the sparks could anneal on the surface without damaging the filter media. Three types of spark protection are available, according to character and intensity of the sparks.



PTFe-Coating, hydrophobic and oleophobic fibres, protection against acids and hydrolysis.

Primary finish membrane, microporous foam coating, high separationefficiency, easy dust release, hydrophobic and oleophobic.

Through the filter-active coating, dust is already separated on the surface. in addition, the antiadhesive surface reduces the adhesive forces between the filter medium and dustcake. the advantages are optimised cleaning, increased service life and high separation efficiency.

Antistatic Structure

optimum discharge of electrostatic  charges, therefore suitable for potentially explosive areas, as well as for electrostatic, strongly chargeable/charged dusts.

Permanent electrical conductive in accordance with Din 54 345 part 1 by adding stainless  steel fibres into the fibre mass in accordance with Din 54 345 part 1.alternative in support of scrim in accordance with Din 54 345 part 1 and part 5


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