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There are many types of masks, probably because of the pandemic, you have heard of surgical masks, FPP2 or even FPP3. However, according to one expert, all of them are likely to leak. However, elastomeric masks do not have this problem.
Jose Luis Jimenez is a professor of biochemistry at the American University of Colorado. Through his Twitter account, he has explained that there is a possibility of contagion with the vast majority of masks and this is because the fit in many cases is not good.
Although the material of an FFP2 or KN95 mask, now banned in Spain, has an effectiveness of 95%, if it does not have a proper fit, you would still be quite exposed to aerosols and contagion.
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For this purpose, he explained that there are other masks called elastomeric masks, which, although they are more 'edgy', are much safer than the rest.
For example, 3M markets theirs through Amazon at a price of 18.67 euros. This type of mask fits over the head with elastic bands and has the same fabric as an FPP2 mask, but with an additional HEPA filter that would make it even more difficult for particles to pass through.
The filters are changed every few hours, so they do not require much maintenance.
Although they are designed for "gases, vapors or particles" Jimenez assures that he notices that the fit is much better and the possibility of contagion is much lower. They also have the advantage that they do not fog up the glasses, as the air comes out of the sides and does not come directly from the nose.
from Business Insider https://ift.tt/2NafYKC
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