The inner layer should be made of absorbent material, like cotton.
The middle layer is designed to work like a barrier and should be made of a non-woven material like polypropylene.The WHO also recommended that people avoid stretchy face masks for their lack of ability to filter out particles, as well as ones that are made of silk or gauze. More advice, per the WHO: Face masks need to have a close fit over your nose, cheeks, and chin.
And, while there is a lot of emphasis on wearing a mask to protect other people, Dr. Watkins says it likely offer some protection for you too, given that it’s a physical barrier.Support from readers like you helps us do our best work. Go
Source: Education Headlines (educationheadlines.net)
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