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New ASTM Standard for Face Coverings: ASTM F3502

Since February of 2020, we’ve been asking for standards for masks/face coverings used by our communities. Finally, the American Society for Testing and Materials (ASTM) has established a national  standard (ASTM F3502) for “Barrier Face Coverings” that are neither medical masks according to ASTM F2100 standards nor respirators according to NIOSH standards. This new standard […]

WHO Fabric Mask Guidance – December Updates

On December 1, 2020, the World Health Organization (WHO) updated their guidance on fabric masks, “Mask Use in the Context of COVID-19 (December, 2020)”, including their “Updated Guidance on Non-Medical (Fabric) Masks” (p. 19-22). This post pulls out key quotes from the new WHO guidance, touching on their recommendations for layering, mask performance standards, and […]

Adopting WHO Guidance on Fabric Masks for COVID-19

This paper describes key differences between the WHO and the CDC fabric mask guidelines, including the rationale for the inclusion of hydrophobic polypropylene materials in the WHO guidance, and was initially shared on the SSRN Preprint Server on June 26, 2020. [Update: December 2020)] The WHO updated their guidance on Fabric Masks December 1, 2020. […]

Research Highlights: NWPP Filtration Efficiency from Long et al 2020

This post is the first in a series of “Research Highlights” where we discuss select data and research from the literature in the context of community mask making efforts. In this post, we take a look at the filtration and breathability data for nonwoven polypropylene (NWPP) mask materials presented in: Long KD, Woodburn EV, Berg […]

Mask Fabrics: Introduction to Fibers and Fabrics

How Do I Choose Fabrics for Masks for COVID-19? Since March, it seems like there has been a constant barrage of conflicting information about which fabrics are the best for masks for COVID-19. We’ve put together this crash course on mask fabrics to provide some of the fundamental concepts in fabrics and how they are relevant for our collective mask making efforts.

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