To add a little context about ASTM; lightly edited from their Wikipedia page[1]: "ASTM International ... is an international standards organization that develo

To add a little context about ASTM; lightly edited from their Wikipedia page[1]: "ASTM International ... is an international standards organization that develops and publishes voluntary consensus technical standards for a wide range of materials, products, systems, and services." They're providing easier access to documents including test methods to evaluate face mask efficacy (ASTM F2101-19, ASTM F2299). [1] - https://en.wikipedia.org/wiki/ASTM_International https://en.wikipedia.org/wiki/ASTM_International