When and how to wear surgical medical masks to protect against coronavirus(covid-19)
Before putting on a face mask, clean your hands with alcohol-based(70%alc) hand rub or soap and water.
with alcohol-based hand rub or soap and water.
Replace the mask with a new one as soon as it is damp and do not re-use single-use masks over and over.
To remove the mask: remove it from behind (do not touch the front of mask); discard immediately in a closed bin; clean hands with alcohol-based hand rub or soap and water.Cover your mouth and nose with mask and make sure there are no gaps between your face and the mask.
Avoid touching the mask while using it; if you do, clean your hands
K95, KN95 AND 3 PLY SURGICAL
Coughing and sneezing produce a “muzzle velocity” of 50 meters/second (for sneezing) or 10 m/s (for coughing), rendering the two-meter protection zone of little assistance without an additional barrier in the form of a mask.
The two classifications also signify the number of particulates filtered out by the mask, the FFP2 filters 94% and FFP3 filters 99%. The more particles that need to be filtered, the greater the number of filter material layers. Consequently, masks in the higher protection classes are thicker, meaning breathing resistance is higher.
However, unlike simple facemasks(KN95,N95, 3PLY) or surgical masks, respiratory masks protect against aqueous and oily aerosols, smoke and fine dust in. Their protective function is verified by the Europe-wide EN 149 standard and divided into FFP2 and FFP3, these standards verify protection from avian flu, SRAS, tuberculosis, as well as infection respiratory pathogens, and bacteria.
Particle-filtering face masks protect against particles, but not gases or vapours.
The respirator face mask, which protects the wearer from aqueous and oily aerosols, smoke, and fine dust, is also more effective at protecting against airborne infectious agents such as COVID-19 and SARS. Respirator masks prevent viruses from entering the body through the mucous membranes of the mouth and nostrils.”
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