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Hepa Filtration
Viledon HEPA and ULPA Filters – The Patented Solution for Sterile Air and Clean Rooms

In a class of their own for technology and performance
While the performance qualities of air filters in Classes F 5 to F 9 are assessed in terms of the efficiency for the particle size 0.4 µm, averaged over the dust loading, to EN 779, HEPA and ULPA filters from Class H10 upwards are classi-fied in terms of their particle-size-referenced mini-mum efficiency in new condition as laid down by EN 1822. This classification by minimum collec-tion efficiencies is based on minimum curves de-scribing the arrestance characteristics of HEPA and ULPA filter media with defined particle sizes at nominal media velocity.The particle size at which the medium exhibits the lowest collection efficiency is called the Most Penetrating Particle Size (MPPS). The typical para-bolic shape of these minimum curves shows that particles both larger and smaller than the MPPS are arrested more effectively The European standard EN1822 replaces various national standards like DIN 24183, DIN 24184, BS 3928 and AFNOR 44013: when EN 1822 was drawn up, it was based on DIN 24183, and is largely identical to it.EN 1822 distinguishes between HEPA filters (High-Efficiency Particulate Air Filters) up to Class H14, and ULPA filters (Ultra Low Penetration Air Filters), from Class U 15 upwards. .


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Elaborate in every detail ...


Viledon HEPA and ULPA filters are manufactured using our patented thermal embossing process or the minipleating technique. In the minipleat-ing technique, thin hotmelt threads serve for fix-ing and spacing the pleats. It is used for pleat depths of up to 100 mm.

In the thermal embossing process, a comple-mentary pair of cylinders simultaneously em-bosses conical dimples and the subsequent pleat tips into a heated micro-glassfiber paper con-taining a thermoplastic bonder. The bonder then hardens again, fixing the embossed structures in the paper