This is interesting development by Army.
Quote:
The material is made of Milliken's patented anti-microbial "BioSmart" technology and will be black in color. The fabric binds chlorine bleach from each wash cycle to the surface of the fabric, according to Milliken's website. Products with BioSmart fabric must be washed with an EPA-registered chlorine bleach to charge the fabric prior to each use, the website states, with the fabric remaining durable for up to 75 launderings.
Army Times Article https://www.armytimes.com/news/your-army/2020/05/19/anti-microbial-machine-washable-face-masks-coming-to-soldiers-to-help-protect-against-coronavirus/Quote:
Army researchers at the command did release filter rates for other materials. They reported that four-ply microfiber cloth, which can be found in the cleaning section of most big box stores, filters out more than 75 percent of particles similar in size to the coronavirus.