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What are the standards for testing mask antivirus?
(1) Particle filtration efficiency
To understand whether to prevent viruses, the first step is to understand how viruses are spread. To understand how to spread, the main thing is to understand the carrier of communication.
Here we only talk about the carriers that can be breathed, two types: 1. droplets and 2. aerosols.
Droplet
Diameter: 1-5 millimeters.
Property: Non oily liquid particulate matter.
Maximum propagation distance: 8 meters (approximately for reference).
Causes: Drops directly generated by speaking, coughing, and sneezing.
aerosol
Diameter: 0.1 millimeters or less (the smaller the distance, the farther the propagation distance).
Property: Non oily solid or liquid particulate matter.
Maximum propagation distance: several hundred meters.
Reason for occurrence: When the droplets are sprayed out, smaller droplets appear, and then these droplets float in the wind, releasing themselves and indulging in sexual activity everywhere.
Supplement: The spread of the virus also requires a certain amount of concentration. Although aerosols over long distances have small particles as small as 2 micrometers, their concentration will not reach the level of infectiousness.
So for the general public, as long as the particle filtration efficiency meets the standard, we can prevent viruses. In terms of popularity, Dust mask can basically prevent viruses, and the effect is no less than medical masks. The key now is that the masks are all made of non-woven fabric, which basically isolates small particles.
(2) Airtightness
Stereoscopic, with good tightness, it can certainly better prevent these particles.
In addition to the airtightness of the mask itself, wearing it correctly is also crucial.
