The system sprayed a liquid with tiny particles of solid matter in the air. After that, its presence was counted in products made of different fabrics.
American physicists have conducted a thorough testing of homemade face masks to determine their protection level against the coronavirus infection. As it turned out, two-layer products made of silk or cotton displayed the best results.
In order to carry out these tests, physicists created a unique aerosol system that allowed them to study the ability of certain face masks to retain harmful particles.
The system sprayed a liquid with tiny particles of solid matter in the air. Then its presence was counted in products made of different materials. The masks made of several layers of material, which have characteristics similar to those of a N95 respirator, showed the best results. A two-layer product made of cotton and silk became an incontestable winner among all the tested samples.
In this regard, the authors of the study recommend using face masks consisting of a combination of several types of fabrics to improve the effectiveness of protection. For example, the alternation of cotton, flannel, silk and chiffon was called a good solution.
Scientists also remind that these face masks should fit tightly a person’s face and be undamaged.