Cotton might seem to the fabric of choice for most cloth masks, but a single layer will not work well in preventing particles from penetrating, so it is recommended to use several layers of it.
The question – how many layers are needed? Generally, the more easily you can see through a fabric once you hold it up to a light, the more layers of the fabric needed to create an effective face mask.
The main purpose of wearing a face mask is to catch outgoing particles from an infected individual before they reach the air, not to stop the viral particles from entering. The majority of fabric masks do not snugly fit enough to provide excellent filtration of any inbound viral particles, which are smaller than one micrometer in size.
Since the main purpose of a face mask is to catch any outgoing particles, there is no need to include a filter in your mask. If you decide to add a filter, go for a filter that is made for face masks, instead of those made out of furnace filter material that might contain microscopic particles that are detrimental once inhaled.
Remember that you must make a face mask using a fabric that feels comfortable and breathable so that you can use it regularly. In most instances, you need to experiment until you find the right fabric.
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Learn how to stay safe by enrolling in a mask fitting test which is a requirement for many workplaces and school admissions or the available masks for sale by visiting our face mask sale page.
https://www.healthline.com/health-news/face-masks-importance-battle-with-covid19
https://www.bbc.com/future/article/20200504-coronavirus-what-is-the-best-kind-of-face-mask
https://www.medicalnewstoday.com/articles/types-of-face-mask