• ITA RWTH Aachen

What makes the nano-filter so special?

In our post "How filters for face masks typically work" we explained the different layers of a "normal" surgical and FFP 1-3 face mask. In this article we explain you why we use nano-filters, what makes them different and how they are produced.


High filtration, high breathability

Current filter materials in face masks are mostly based on meltblown polypropylene fibers. Their protection level depends on how thick the meltblown layers are. High filtration and protection levels against tiny particles like airborne viruses and bacteria comes at a cost: it is pretty hard to breathe through them. 



Comparison of our NANO FILTER. to meltblown filters used in FFP2 masks


That’s why we use nano filters: They are created in an electromagnetic field, are extremely thin and have more nano pores than traditional melt-blown fiber filters. You can breathe in and out more easily whilst being protected against harmful particles.



Comparison of FFP 2 standard with our nano-filter material at a maximum pressure drop of 2.4 mbar


Our filters retain up to 98% of tiny particles that are between 0.02 micrometer and 2 micrometer in size. In comparison, human hairs have a diameter of about 50 micrometer. And droplets from coughing and speaking, which can contain viruses and bacteria are between 12 and 21 micrometers in size.