Adding a third layer to cloth face masks is now recommended for preventing the spread of COVID-19. Non-woven polypropylene fabric is the material of choice for this third layer

With masks being made at home and by local clothing companies, here’s what you need to know about Public Health Agency of Canada’s new recommendations.

Every study that has examined layering has found that using additional layers in face masks improves filtration, but some fabrics provide more filtration than others. We support the public health recommendation and specifically recommend the use of industry-grade “spunbond” polypropylene as a middle layer in washable cloth masks.

Spunbond polypropylene destined for the clothing and furniture industries has a fabric-like feel. It is washable and will not divert supply of medical-grade polypropylene from the manufacture of formal personal protective equipment.

https://theconversation.com/polypropylene-the-material-now-recommended-for-covid-19-mask-filters-what-it-is-where-to-get-it-149613

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