Ozone Can be an Effective Disinfectant of Reusable Face Masks
Recent tests done by several universities and bio nanotech research centers in Korea showed that Ozone gas may be effective at disinfecting reusable face masks.
As face masks became scarce because of the Covid-19 pandemic, healthcare workers were faced with having to reuse their face masks and the need to find an easy and rapid disinfection method that rendered the used face masks sterile and safe to use a few more times became apparent. The tests showed that when face masks, experimentally contaminated with the human coronavirus HCoV-229E as a surrogate for SARS-CoV-2, were exposed to Ozone gas at about 120 ppm for either 1 or 5 minutes, no viable HCoV-22E was recovered from the face masks.
Furthermore, no structural or functional deterioration of the face masks were seen under an electron microscope and by a particulate filtration efficiency test the first few times that the masks were exposed. Ozone gas is a strong oxidizing agent with the ability to kill viruses on hard-to- reach surfaces, including the fabric structure of face masks. The results suggest that it may be possible to rapidly disinfect contaminated face masks using Ozone gas in a tightly controlled and sealed environment.
Visit https://www.medrxiv.org/content/10.1101/2020.04.26.20080317v2.full.pdf+html for a reprint of the full test, its details, and results.