VTT-research has tested different mask fabrics and made simulations of the spread<p>With mask:
<a href="https://youtu.be/blpit-6A7Yo" rel="nofollow">https://youtu.be/blpit-6A7Yo</a>
(red is dry particles, blue is droplets)<p>Without mask:
<a href="https://youtu.be/HsGJlANzeq8" rel="nofollow">https://youtu.be/HsGJlANzeq8</a><p>Tests re-affirm the existing conclusion that non-medical mask-wearing helps from spreading the disease but is not very effective in protect the wearer.<p>The best available masks are made of microfiber and can filter up to 70% of particles smaller than 2.5 micrometers. Conventional garment fabrics filter 20-45% of particles smaller than 0.65-3.3 microns in size, while FFP2 shields 96% and FFP3 99% of particles up to 0.35 micrometers. This means that a user of fabric masks will receive several times the dose of viruses under exposed conditions compared to a user of professional respirators.<p>From conventional fabrics microfiber mask is best, second is polyester, cotton is the worst. One should wash them in hot water (90 celsius) after each use or throw them away.<p>source (in Finnish):<p><a href="https://www.vttresearch.com/sites/default/files/2020-05/Mediainfo14052020-kangasmaski-simulaatio-teollinentuotanto.pdf" rel="nofollow">https://www.vttresearch.com/sites/default/files/2020-05/Medi...</a><p><a href="https://www.vttresearch.com/fi/uutiset-ja-tarinat/kangasmaski-ei-suojaa-kayttajaansa-koronavirukselta-mutta-voi-suojata-muita" rel="nofollow">https://www.vttresearch.com/fi/uutiset-ja-tarinat/kangasmask...</a>
That's a good lesson in data science (the author is one). He has all the numbers right but did he forget some things ?<p>I didn't see anything about re-usability of the masks (no one has an endless stash of mask with a fresh one for every use)? What about using them right when putting them on/off and while wearing them (masks are efficient only when worn correctly, or not?)?
I've been following Dr. Fauci's advice. He is the expert.<p><a href="https://youtu.be/LScHAvufgfM" rel="nofollow">https://youtu.be/LScHAvufgfM</a><p>Thoughts?