3 ms·
Aerosol viral loads are (if I heard correctly) 50x smaller than asbestos particles. OSHA doesn't allow cloth masks to be used around asbestos. If this were a f
by zdragnar 5y ago
Aerosol viral loads are (if I heard correctly) 50x smaller than asbestos particles. OSHA doesn't allow cloth masks to be used around asbestos.
If this were a flu that spread primarily as droplets, cloth masks would have their place. As it is, we have known since early on that wasn't the case, and that cloth masks are about as useful as a cloth bonnet would be useful as a motorcycle helmet.
- davmar 5y agohttps://pubs.acs.org/doi/10.1021/acsnano.0c05025 https://pubs.acs.org/doi/10.1021/acsnano.0c05025 "Materials were microimaged and tested against size selected NaCl aerosol with particle mobility diameters between 50 and 825 nm. Three of the top five best performing samples were woven 100% cotton with high to moderate yarn counts, and the other two were woven synthetics of moderate yarn counts" This image in particular: https://pubs.acs.org/na101/home/literatum/publisher/achs/journals/content/ancac3/2020/ancac3.2020.14.issue-7/acsnano.0c05025/20201113/images/medium/nn0c05025_0002.gif https://pubs.acs.org/na101/home/literatum/publisher/achs/jou... You can see N95 non-woven performs the best, but cotton twill does provide protection. Cool analogy tho.
- zdragnar 5y ago50-850nm is way off; coronavirus are 20-500 tops. I guess we should call OSHA and tell them that it is okay to consider cloth masks as safety equipment around asbestos.