Washable 50 times. Fabric performances have been mesured by DGA NRBC, 05 rue Lavoisier – 91710 VERT LE PETIT under the file RP/20-3916/DGA MNRBC/2000305/NP Model n°1 on may 14, 2020 and washed 50 times IFTH 2020-04-17-018-1 on may 25, 2020.

Before washing, the mask has more than 86 % filtration efficiency for particules under 3 microns coming from mask holders.

Before washing, the mask breathability was mesured at 432 L.m-2.s-1 and allow a 4 hours use.

After 50 washes, the mask  had a filtration efficiency of more than 90.9 % for particles under 3 microns coming from mask holders.

After 50 washes, the mask breathability was mesured at 228 L.m-2.s-1  and allow a 4 hours use.

After 1 wash, the mask had a filtration efficiency of more than 93 % for particles under 3 microns coming from mask holders.

After 1 wash, the mask breathability was mesured at 269 L.m-2.s-1 and allow a 4 hours use.