Loffen Shield Antimicrobial Face Mask - How does it work?

Loffen Shield Face Mask - Reusable and Antimicrobial Face mask

Material Information

Thank you for your interest! This post will offer you information about the material used in the antimicrobial, washable and reusable Loffen Shield face mask.

Loffen Shield is a face mask, made out of antimicrobial polyester fabric, which has a ready made antimicrobial treatment. (VTT, The Finnish visionary research, development and innovation center stated that polyester is a much better fabric than cotton to be used in face masks, as it filters almost twice as many particles). This treatment begins to destroy bacterias, microbes and viruses as soon as a contact occurs between the microbe and the fabric. The fabric is 100% polyester, which is safe, pleasant and allergy free for the user. The elastic bands do not have the antimicrobial feature.

The substance used to achieve the antimicrobial feature is water based and safe for the user. It does not include harmful ingredients such as leaching noble metals (i.e. silver, copper, zink), formaldehyds, metanol, polycrated felons or arsenic, like most of the other antimicrobial treatments do. The safety of the substance has been comprehensively tested against harmful ingredients. The substance is OEKO-TEX and REACH approved and manufactured in EU. The Finnish Safety and Chemicals Agency (Tukes) has approved the use of this treatment and substance in face mask use inside the EU.

No heavy metals

The treatment is made straight into the fiber. It is an so called non-leaking polymer, which will not wear out like most other antimicrobial materials do. The product is sewn into a face mask in our sister company´s (Import Numero 1 Oy) (www.nro1.com) sewing company.

Materials with the same antimicrobial treatment have been used for example for hospital curtains and other professional use only- purposes. It has been studied to have an effect on a wide variety of microbes such as C-Diff Spore and against viruses.

The antimicrobial effect is based on a mechanical process. The polymer has a positive electric charge and attracts the negatively charged micro-organisms. As the microbe gets to a contact with the polymer in the fabric, millions of ”spikes” pierce the cell membrane, causing the biochemicals to get an electric shock. This way the piercing mechanism deactivates the microbe and disallows the growth and spreading of the microbe. This safe and antimicrobial treatment has been made to last repetitive washings in desinfection temperature. (Tested in 75 degrees Celsius).

Before and after...


Test results

A few examples of the bacterial decrease in fabric from different bacterial tests after different times, commissioned by the manufacturer.

%-number indicates the percentage of decrease of bacterias in fabric, when an unwashed fabric is being tested, then after it has been washed for x-times and the result after 1 hour and the same result after 24 hours.

  • Unwashed fabric; 1 h after washing the decrease of bacterias was 99,99 %
  • 20 x washed 60 deg. 1 h after washing <60 %, 24 h after washing 97,1 %
  • 50 x washed 75 deg. 1 h after washing <60 %, 24 h after washing 93,5 %

According to the tests commissioned by the manufacturer it takes 24 hours for the treatment to recover after washings. To ensure the best effectiveness it is recommended to use reserve mask the day after washing.

Effective against corona virus too

The corona virus (EN 18184:2019) has been tested. The test used Corona virus Feline-genus, which is a substitute virus for SARS2/COVID-19, because these SARS2/COVID-19 viruses are only permitted to use in state laboratories due to their dangerousness. This tested virus belongs to the same corona virus family as SARS2/COVID-19 virus.

According to the test EN 18184:2019 with a contact time of one hour the amount of effective viruses (corona viruses) on the fabric decreased by 92,8%.

Below is a listing made by the manufacturer of some tested microbes. 

  • EN1276 Escherichia coli 5 D 5 min 8.21 5
  • EN14476 Norovirus 10 C 5 min 4.67 4
  • EN1276 Pseudomonas aeruginosa 5 D 5 min 6.566 5
  • EN1276 Escherichia coli 5 D 5 min >6.459 5
  • EN1276 Staphlococcus aureus 5 D 5 min >6.298 5
  • EN1276 Enterococcus hirae 5 D 5 min >6.269 5
  • EN13727 MRSA 4 D 5 min >6.50 3
  • EN13727 MRSA 4 C 5 min >6.50 3
  • EN13727 MRSA 4 D 30 sec >6.85 3
  • EN13727 Listeria monocytogenes 5 D 5 min >6.512 5
  • EN13727 Salmonella typhimurium 5 D 5 min >6.194 5
  • EN1275 Aspergillus niger 4 D 1 min >6.46 4
  • EN1275 Candida albicans 4 D 1 min >6.50 4
  • EN1275 Aspergillus niger 4 D 30 sec >6.46 4
  • EN1275 Candida albicans 4 D 30 sec >6.50 4
  • EN13704 Clostridium Difficle (spores) 4 C 5 min >6.70 3
  • EN13704 Clostridium Difficle (spores) 4 C 1 min >6.70 3
  • EN13697 Pseudomonas aeruginosa 5 D 5 min >6.548 4
  • EN13697 Escherichia coli 5 D 5 min >6.358 4
  • EN13697 Staphlococcus aureus 5 D 5 min >6.439 4
  • EN13697 Enterococcus hirae 5 D 5 min >6.315 4
  • EN13697 Pseudomonas aeruginosa 5 D 5 min 7.538 4
  • EN13697 Escherichia coli 5 D 5 min 7.451 4
  • EN13697 Staphlococcus aureus 5 D 5 min 7.177 4
  • EN13697 Enterococcus hirae 5 D 5 min 7.242 4


Import Numero 1 Oy (the manufacturer / sister company)

Featured in Finland´s biggest Business Magazine (Kauppalehti)


Loffen Shield face mask is not dispensable. Because of the ability of the mask to endure multiple washings it can be reused. Tests made in laboratories confirm that the feature remains in the material for dozens of washings and up to at least 90 days.

Loffen Shield f-ace mask reduces effectively viruses and bacterias. Because of this the fabric of the mask will not turn into ”a virus distributor” even if it has been touched by dirty fingers, due to its ability to reduce microbes effectively after getting in contact with microbes, bacterias or viruses. This is important also in case someone against orders puts on or takes of the mask with dirty hands.  

Loffen Shield mask helps to protect the user from viruses and bacterias coming from outside insofar as those microbes get in contact with the fabric. The mask also protects others by stopping and destroying exhaled or spattered viruses and bacterias.

Loffen Shield mask is suitable for long-lasting use. This is why for example freight-, stocking- and waste costs will be minimized. In addition to those the person being sick does not have to leave to a store to buy new face masks.

 Loffen Shield is not a certified medical mask!

This face mask is not a medical respirator to be used in hospitals or a CE-certified surgical mask. It is a reusable face mask, which is not intended to be a medical device. It belongs to the same category as masks made out of normal cotton. The difference is that the material used in this mask has been made antimicrobial in the beginning of the manufacturing process.

Using a Loffen Shield -mask will not guarantee that the person wearing it will not be exposed to a virus, bacteria or a microbe. It is intended to give extra help against spatter and splatter. Manufacturer of the product or the material or the reseller is not responsible for possible sicknesses or being exposed to viruses, bacterias or microbes.

The manufacturer (Import Number 1 Oy Finland) has sold tens of thousands of this for governmental use in Finland and for Stockmann for retail for example. Sisustus1.fi has been retailing this in Finland and now due to high demand abroad, www.sensiprimashop.com was launched. 

Basic Information

Fabric made in: The Great Britain

Fabric: 100% Trevira Cs polyester, 280 g/m2. Super soft.

Antimicrobial substance: Permanently to the fiber attatching polymer, unleaching. Manufactured in EU, OEKO-TEX and REACH approved. The bioside ingridient used in the product is Dimethyloctadecyl[3 (trimethoxysilyl)propyl]ammonium chloride. The Finnish Safety and Chemical Agency (Tukes) has approved the use of this bioside in face mask use in EU.

Washing: 60-90 Celcius.

Washing tests have been done in 75 degrees, which is the normal desinfective temperature. The product sustains that well. The elastic bands might weaken after multiple hot washings.

Tumble dying: Allowed.

Ironing: Allowed on medium temperature