publish date 2021-07-19 15:27:33
Many designs and types of masks have spread around the world, among which were (non-medical) fabric masks, in the context of protecting against infection with the Corona virus, but the extent of their effectiveness is still a controversial topic.
Physicist and Dr. Kobin Axon described these masks as just “comfortable blankets”, doing little to reduce the spread of corona particles.
And he warned that some cloth masks have holes that are not visible to the naked eye, noting that they are 500,000 times the size of corona virus particles.
He also explained that the small sizes are not easily understood at the present time, pointing out that they can penetrate those gaps in the cloth masks, according to the British newspaper, “The Telegraph”.
“Once a particle is not on a biological surface, it is no longer a biomedical issue but simply a matter of physics,” he said. The real mechanisms involved are better evaluated by science, said Brunel University’s senior lecturer in engineering.
Also, he added, “When a particle enters another body, it is due to a vital medical issue, but the controversy over the muzzle is about the particle’s journey.”
He added that masks can catch droplets and phlegm from coughing, noting that corona is mostly spread through air dust.
And he continued, “Not everyone who carries Covid is coughing, but they are still breathing, that atmospheric dust penetrates the masks and makes them ineffective.”
Cloth mask standards
It is noteworthy that the purpose of the cloth masks is to trap the respiratory droplets released when the wearer talks, coughs or sneezes, according to the Mayo Clinic website. It also serves as a barrier to protect the wearer from inhaling respiratory droplets from others.
Also, the most effective cloth masks are those made of multiple layers of dense fabric, such as cotton, that prevent respiratory droplets from entering or leaving the mask.
For its part, the World Health Organization advises to check the level of filtering of the cloth mask, the quality of its ventilation and its suitability to the shape of the face.
The organization does not recommend the use of masks with holes or exhalation valves because they allow unfiltered air to escape from the mask.
Also, the cloth mask should consist of three layers of fabric, which is an inner layer of an absorbent material, such as cotton. and a middle layer of a non-woven, non-absorbent material, such as polypropylene.
Plus an outer layer of a non-absorbent material, such as polyester or a polyester blend. And if you buy a cloth face mask from a store, make sure it meets the national performance standards.
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