PRECIMASK® is a high-performance, durable face mask aiming to bring a two-fold solution : protect the wearer and his environment against all forms of aerosols and bacterial particles while reducing the environmental impact of disposable respiratory protective devices.

PRECIMASK Air - Vue Profil

The use of masks with an appropriate protection level remains as one of the most efficient ways to fight against the spread of the Covid-19 virus and the sanitary crisis it generates. The Precimask® is a high performance and durable face mask aiming to bring a two-fold solution: provide an effective contribution to barrier gestures and reduce the environmental impact of protection devices. Furthermore, the very long shelf life of Precimask® solves the issues related to the management of safety stocks for protective masks.


SARS-COV2, the coronavirus responsible for COVID-19 is 0,125 µm in size, or 1/10 micron (1 micron is a 1/1000th of a millimeter).

However, the virus does not circulate alone, but in aerosol droplets or secretions released by the individual. These droplets have typical size in the range of 5 to 10 µm, and down to 3 µm for the smallest ones. The latter tend to remain suspended in the air for a longer time and are hence the most contagious. As a consequence, the masks recommended to fight against the spread of COVID-19 have their filtration efficiency evaluated for aerosols of 3 µm.

Mechanisms of COVID contagion by aerosols

See recent article written and published on october 4th 2020 by Dr Dominique Dupagne, expert and also columnist of a French radio program called “La Tête Au Carré” on France Inter Radio.

What are the current standards for masks ?
In this context of the COVID-19 pandemic, many misunderstandings have emerged around the different standards relating to masks. In total, national and international standards provide 4 types of masks :

UNS masks are a category of masks created especially for the COVID-19 pandemic emergency in march 2020. They do not require approval, but only an evaluation of the filtration efficiency and breathability requirements by a competent laboratory (ref. DGE site : https://www.entreprises.gouv.fr/fr/covid-19/entreprises-comment-faire-tester-masques). In Europe, guidelines for face masks are provided by the document CEN Workshop agreement CWA17553 – Community face coverings, June 2020.

UNS 1 masks must stop 90% of 3 µm particles. Their tightness (or leak rate) is not specified. Most of these masks are constructed with cloth or fabric and can be washed and reused a certain number of times. Successive washes result in a degradation of the filtration efficiency of these masks.

Masque UNS1
Mask type
Particle filtrtation rate (>3µm)
UNS1 90%
Sports mask (UNS1) 90%

Since february 2021, a new specification for sports masks has emerged. In comparison with conventional UNS1 masks, the sports masks has the same filtration rate and also uses a filter made of textile material. However, it may have solid parts that allow it to be more airtight and provide better head support. its air permeability is also three times greater than UNS1 masks to allow for optimal breathing at effort.

Surgical masks (ref. Standard NF EN 14683 AC) are masks intended for the sick to prevent them from infecting other people, or traditionally for health professionals to prevent contamination of patients in medical environment. They are flexible and inexpensive to buy but must be discarded after 4 hours of wearing. Depending on their type, they must stop up to 95% of 3 µm particles. Their air-tightness level is not standardized or specified.

Masque Chirurgical
Mask type
Particles filtration rate (>3µm)
Type I 95%
Type II 98%
Type II R liquid resistant Type II

FFP masks (ref. Standard NF EN 149) are masks intended for healthy people to protect them from sick people. They must filter aerosols with an average size of 0.6 µm and have a standardized leak rate of up to 22% for type FFP1. These soft masks are expensive and should also be discarded after 4 hours of use. In addition, their effectiveness is no longer guaranteed if they are wet or dirty.

Masque FFP
Mask type
Particle filtration rate (>0,6µm)
Leak rate
FFP1 80% 22%
FFP2 94% 8%
FFP3 98% 2%

FMP masks (ref. Standard EN 1827) are rigid masks intended to protect the wearer against environments containing dust, smoke  and other toxic and harmful aerosols. These masks are typically used in the chemical industries. They are the only ones equipped with disposable filters and a washable and reusable seal. Their flexible seal provides excellent air tightness. However, these are heavy and expensive equipment and offers low breathability.

FMP mask cartridges (ref. EN 143) must filter two types of aerosols, one with an average size of 0.4 µm and the other with an average size of 0.6 µm.

Masque FMP
Masks type
Particle filtration rate (>0,6µm)
Leak rate
FMP1 80% 2%
FMP2 94% 2%
FMP3 99.95% 2%
What masks against COVID-19 ?
From a virus perspective alone

With such a small virus size, almost no mask can stop it. However, the FFP3 and FMP3 masks should still be able to achieve a good level of filtration for this particle size.

From a droplet point of view

These droplets are between 5 μm and 10 μm in diameter and can therefore be stopped by most of the masks described above depending on their filtration efficiency and air tightness.

However, although the fabric of surgical and UNS1 masks can filter droplets containing SARS-COV2, their limited air tightness does not guarantee optimal protection. On the other hand, FFP and FMP masks provide improve filtration efficiency and better air tightness, but due to their configuration and characteristics, they do so in a more expensive and less elegant way and offer lower breathability.

PRECIMASK® filtering efficiency

For PRECIMASK®, here are the filtration efficiency results obtained according to EN 14683 AC for 5 samples of our filter cartridges facing a bacteria aerosol of 3 µm. This test allows us to determine the bacterial filtration efficiency (BFE) of the cartridge:

  • Cart. 1 (BFE 96,53%)
  • Cart. 2 (BFE 98.21%)
  • Cart. 3 (BFE 96.37%)
  • Cart. 4 (BFE 96.97%)

Based on the results of the bacterial filtration efficiency (BFE) characterization report from the Engineering and Health Center of the “Ecole Nationale Supérieure des Mines de Saint-Etienne”.

The results are clear :

our cartridges have a BFE of over 95% for particles with an average size of 3µm. These tests therefore place PRECIMASK® at the same filtration level as surgical masks.

Comparison of filtration levels

taking into account the leakage rate and filtration efficiency

Podium - EN

FFP2 mask

  • Leak rate : 8% (standardized)
  • Filtration : 100% (particles of 3µm)

(100% – 8%) x 100% = 92%
Or 92% filtration

  • Leak rate : 2% (measured)
  • Filtration efficiency : 95% (particles of 3µm)
Overall efficiency :
(100% – 2%) x 95% = 93.1% 

Or 93,10% filtration

surgical mask

  • Leak rate : 20% (not standardized)
  • Filtration : 95% (particles of 3µm)

(100% – 20%) x 95% = 76%
Or 76% filtration

considerations regarding breathability

For the same filtration area, the ceramic filter cartridge of PRECIMASK® allows better breathability compared to most UNS, surgical, FFP and FMP masks.

We can estimate that a person at rest takes 20 breaths per minute of 0.5 L of air and therefore needs 10 liters of air per minute. However, an athlete can increase their oxygen requirements up to ten times and hence the respiration flow rate.

In the case of UNS masks and surgical masks, the permeabilities are directly specified in the standards in liters per square meter per second. FFP and FMP masks, the breathability is evaluated by pressure drop measurements at different air flow rates.
Flow rate through an area equivalent to Two PRECIMASK® cartridges (in L/min at 100Pa)
  • Needs of a person at rest
  • UNS1 mask
  • Surgical mask
  • UNS1 Sport mask

The breathability of a mask depends on the filtration medium permeability and the filter surface. In the table below, we report the inherent permeabilities of different filtration media and the permeability at a filtration area equivalent to two PRECIMASK® cartridges (Ø 36mm). The filtration area is greater for UNS1 and surgical masks to compensate for their lower permeability. The leakages around these masks also improve their breathability, but reduce the protection level as explained above. For PRECIMASK, despite the lower filtration area, a good breathability is ensured thanks to the excellent permeability of the ceramic filter medium.

Mask type
Air permeability of the filter material at 100 Pa
Permeability related to the surface of the 2 PreciMask® cartridges
UNS1 mask > 96 l/m²/s 14 L/min
Surgical mask > 139 l/m²/s 20 L/min
UNS1 Sport mask > 300 l/m²/s 43 L/min
PRECIMASK® > 380 l/m²/s 54 L/min
Positioning of PRECIMASK®

PRECIMASK® is a very innovative face mask which fill a normative void. its offers the same level of air tightness and reusability as FMP masks with a filtration medium having a retention efficiency equivalent to that of surgical masks. However, filtration cartridges of FMP masks have to be replaced on a regular basis, whereas in the case of PRECIMASK® there is no need to change filter cartridges.

The PRECIMASK® cartridges are more effective at filtration than the cloth / fabrics of UNS1 masks and at the same level of surgical masks. Furthermore, PRECIMASK® provides enhanced air tightness and hence higher protection. In addition, the UNS mask requirements advise against cleaning protocols by heating or boiling textile face masks, as this may damage them. This is not the case for the stable materials with which PRECIMASK® is constructed. The PRECIMASK® structure can be easily cleaned with water and the cartridges can be placed in the oven or in boiling water.

The silicone seal in contact with the face has been designed and developed to ensure the user’s comfort, and also its protection, thanks to a material with the medical approvals necessary for direct contact with the skin.


At a time when ecology plays an increasingly important role in our lifestyles, we want to reduce the environmental impact of the COVID-19 pandemic through our products.  Indeed, disposable masks are produced from synthetic fibers (polypropylene) which have long degradation times. Once worn, they will increase household waste or at best will be recycled (in insulation materials for example), when they are not directly thrown into our environment. The ability of PRECIMASK® to protect its wearer and the environment without generating waste or consumables, reduces the amount of waste generated by the COVID-19 pandemic by replacing several hundred disposable masks with a single reusable product.

Every month, humanity uses 129 billion surgical masks to protect ourselves from the pandemic. This represents 451,000 tons of waste.

Thanks to its ceramic filters, PRECIMASK® is the world’s first zero waste mask.

The shelf life of PRECIMASK® in its original packaging is more than 40 years (with specific storage conditions). Disposable masks have a shelf life. With PRECIMASK®, there are no need to renew stocks of disposable masks, and they can be stored for 40 years in their packaging.

Last but not least, PRECIMASK® is designed, manufactured, and assembled in France according to the most stringent European quality standards. The ceramic filters, developed in the Saint-Gobain Research and Development center of Cavaillon (Vaucluse) is produced in France and Germany.

Condensation formation in PRECIMASK® is normal

As a guide, a person releases about 50 grams of water vapor per hour when exhaling. With surgical masks, UNS and FFP, his vapor is partially absorbed by the tissue or leaks from the mask. What eyeglass wearer has not had this experience ?

However, if the static electricity in the fibers of these masks stops particles containing viruses, the moisture destroys their properties to the point of rendering the masks ineffective after 4 hours.

In the case of PRECIMASK® which have much lower leak rate than disposable masks or washable fabrics, the air tightness of the silicone seal prevents water vapor from escaping. If the outside temperature is low enough, water vapor will condense on the walls of the PRECIMASK®, it is collected in a cavity inside the mask, and in no way disturbs the wearer, even if it is wearing glasses !! However, the protective capacities of PRECIMASK® are not as irreparably degraded by humidity as with non-washable disposable masks.

Prospects for additional uses

The PRECIMASK® was designed to respond to the urgency of the current pandemic. Nevertheless, despite the vaccination campaigns, the scientific councils fear the appearance of new variants from October 2021 on against which the available vaccines may not be as effective.
Moreover, it is still not yet formally proven that vaccinated people cannot carry the virus and transmit it.
Last but not least, scientific studies predict the start of an era of repeated pandemic crisis within increasingly short intervals.

PRECIMASK - Masque Protecteur Durable Zero Dechet

Despite the hope that the vaccination campaigns will have their expected effect by the end of the year, it is very likely that the regulations relating to barrier gestures and the wearing of masks in companies and public places will continue even beyond.

In addition to its respiratory filtration capacities linked to the current pandemic, we have seen that PRECIMASK® also provide protection against other bio-contaminants such as pollen and mold spore, certain house dust mite allergens and dust.

Furthermore, Companies have observed that the mandatory wearing of masks has considerably reduced absenteeism and medical related leaves linked to seasonal viruses (influenza, gastro, etc.), this fact suggests that an occasional use of masks during epidemic outbreaks identified within a Company shall become a sustainable solution to consider.

…, we have seen that PRECIMASK also provides protection against other bio-contaminants such as pollen and mold spore, certain house dust mite allergens and dust.

PRECIMASK® is a mask with a very high level of protection and optimal durability. its enhanced air tightness provides protection for the wearer but also for their environment. Its filtration capacities allow them to protect the wearer against viruses carried by ambient aerosols. the ease of cleaning and durability allow them to be reused and generate no waste.

It’s a true technological and ecological revolution
Filtering, protective and durable mask equipped with cleanable and reusable filters.
PRECIMASK - Airtight
Enhanced air tightness
PRECIMASK - Protective
PRECIMASK - Environmentally Friendly
Environmentally friendly
PRECIMASK - Aesthetic
PRECIMASK - Hygienic and easy to use
Hygienic & easy to use
PRECIMASK - Flexible
Flexible & comfortable
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