No mask provides 100% protection against viruses, Russian experts noted after investigating the main types of masks sold in stores and pharmacies.

According to Rg.ru, experts have studied disposable and reusable masks and personal protective equipment such as respirators FFP2 of 14 brands, 9 of which are produced in Russia, and 5 - in China.

All masks met mandatory safety requirements and were free of formaldehyde, acetone, methanol, and other chemicals. They did not irritate the skin.

According to experts, when choosing a mask, it is better not to focus on the material from which it is made, since the effectiveness depends more on the assembly, the location of the layers, and the density of the fabric.

The experiment later has shown that all masks pass viruses, and none of them guarantees 100% protection. The best results were shown by one non-fabric reusable mask, which, as it turned out, allows up to 56.2% of viruses to pass through. The worst result was shown by the KN95 FFP2 respirator mask with a valve - its throughput was 97.11%, that is, such a mask retains only less than 3% of viruses.