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Common fabric materials of five major categories including sweatshirts, T-shirts, towels, scarves, and cloth masks were selected for aerosol penetration tests... Fabric materials for each category were randomly selected from three different manufacturers based on availability. The commercial cloth masks were advertised as pollution and allergen masks and did not make any claim as to their effectiveness for submicron-size particles. It should be noted that none of the other fabric materials was designed to be used as a filtering media. N95 respirator filter media was tested in parallel with the fabric materials for comparison of the filtration performance against submicron-size aerosol particles.
RESULTS
...
Monodisperse aerosol penetrations
Penetration levels for monodisperse aerosol particle (20–400 nm range) were combined with those for 500–1000 nm range particles measured as a function of particle size. For the cloth masks, monodisperse aerosol penetration levels (35–68%) for 20 nm size particles increased steadily, reached maximum (73–82%) at 100 nm range, plateaued up to 400 nm, and increased slightly up to 1000 nm at 5.5 cm s−1 face velocity.
Penetration levels for the three sweatshirt and T-shirt models were, respectively, in the 30–61% and 56–79% ranges for 20-nm size particles and increased to 80–93% and 89–97% for 1000 nm particles
In the case of towels and scarves, penetration levels varied from 9 to 74% for 20 nm size particles and increased monotonically at 5.5 cm s−1 face velocity. Penetration levels of different size particles increased at 16.5 cm s−1 face velocity at varying levels
I was talking with someone today who insisted that homemade masks were a stupid idea and, "will do absolutely nothing to prevent you from getting the virus."
I was talking with someone today who insisted that homemade masks were a stupid idea and, "will do absolutely nothing to prevent you from getting the virus." I disagreed insisting that an imperfect filter is commonsensically better than no filter. He was not convinced. So after some googling, I found this study from 2010.
This confuses me, so perhaps someone can explain. Why does penetration increase when the size of the particle increases?
originally posted by: Klassified
This confuses me, so perhaps someone can explain. Why does penetration increase when the size of the particle increases?
Saturation of the filtering material would be my guess.
originally posted by: olaru12
It's doesn't matter what kind of mask you wear if you are always adjusting it to make it feel comfortable touching your face and then rubbing your eyes.
originally posted by: olaru12
It's just a matter of time until the NY clothing designers make masks an accessory item. Frilly lace for the ladies and a masculine leather border for the guys and heavy duty buckles and leather straps to keep it snugly against your face and perhaps that polo logo to impress all the rabble just wearing that low class paper thing or a ghetto bandana.
Little prints with puppies and kitties for the children. Les't not forget man's best friend either.
originally posted by: olaru12
It's doesn't matter what kind of mask you wear if you are always adjusting it to make it feel comfortable touching your face and then rubbing your eyes.
originally posted by: DBCowboy
a reply to: scojak
Buy vacuum bags that are HEPA filtered, then cut the vacuum bags to insert into your mask.
originally posted by: nugget1
originally posted by: DBCowboy
a reply to: scojak
Buy vacuum bags that are HEPA filtered, then cut the vacuum bags to insert into your mask.
HEPA filters are made from glass micro fibers which are bad for the lungs and us sewers are now being told not to use them.
Info is changing so fast on what we should/shouldn't do, it's hard to keep up.