Answers to "What Are The Best Materials for Making DIY Masks?"

[BigmanPigman]

3. I looked at the photos on the graphs closely

and the vacuum bag is a regular one I believe. I have been looking at HEPA vacuum filters a lot and they look different, besides I think it would have had to say HEPA if it were using it. I think the towels are terry judging from the edges and pattern.

"Overall, the double layers didn’t help much. The double-layer pillowcase captured 1% more particles, and the double-layer shirt captured just 2% more particles. Yet the extra dish cloth layer boosted performance by 14%. That boost made the tea towel as effective as the surgical mask."

"Looking at the data, the dish towel and vacuum cleaner bag were the top-performing materials. However, the researchers didn’t choose these as the best materials for DIY masks".....read on at the link
https://smartairfilters.com/en/blog/best-materials-make-diy-face-mask-virus/

The top performers were the vacuum cleaner bag (95%), the dish cloth (“tea towel” in the UK! 83%),