http://www.opencircuits.com/index.php?action=history&feed=atom&title=N95_mask 2026-06-26T01:56:37Z Revision history for this page on the wiki MediaWiki 1.34.2 http://www.opencircuits.com/index.php?title=N95_mask&diff=87943&oldid=prev 2022-03-31T01:26:36Z

<p>lots of references, etc.</p> <p><b>New page</b></p><div><br /> Filtering facepieces (FFPs) are face masks produced from a whole piece of filtering material, intended to be disposable.<br /> <br /> N95 are possibly the most well-known.<br /> P95 masks, KN95 masks, KP95 masks, KF94 masks, etc. are very similar.<br /> <br /> Many people are working on developing ways to re-sterilizing N95 masks, including open-source recipes for re-sterilizing N95 masks, in response to the expected shortage of N95 masks during the COVID-19 pandemic.<br /> <br /> Some of the effective sterilization recipes involve<br /> (in no particular order):<br /> <br /> * vapor hydrogen peroxide<br /> * ultraviolet light<br /> * bake in a kitchen oven for 30 minutes at 158 degrees F,<br /> * steam the mask with hot vapor from boiling water for 10 minutes<br /> <br /> In no particular order:<br /> <br /> == overview articles ==<br /> * https://www.cdc.gov/niosh/topics/hcwcontrols/recommendedguidanceextuse.html<br /> * https://www.livescience.com/sanitizing-medical-masks-for-reuse-coronavirus.html<br /> * https://www.apsf.org/news-updates/potential-processes-to-eliminate-coronavirus-from-n95-masks/<br /> * http://www.imcclinics.com/english/index.php/news/view?id=83<br /> * https://multimedia.3m.com/mws/media/1816576O/disinfection-of-disposable-respirators-technical-bulletin.pdf<br /> * https://www.coronavirusmakers.org/index.php/es/58-desinfectando-mascarillas-y-filtros-2<br /> <br /> &quot;Reusability of Facemasks During an Influenza Pandemic: Facing the Flu (2006)&quot;<br /> https://www.nap.edu/read/11637/chapter/6<br /> <br /> <br /> <br /> == Heat sterilization ==<br /> <br /> One heat sterilization protocol:<br /> bake in a kitchen oven for 30 minutes at 158 degrees F (70 degrees C).<br /> &quot;European certification requires a [N95] mask to be able to withstand 158 degrees Fahrenheit (70 degree Celsius) for up to 24 hours.&quot;<br /> <br /> == Ultraviolet sterilization ==<br /> <br /> The ultraviolet sterilization protocol:<br /> ultraviolet germicidal irradiation (UVGI)<br /> has been successfully used to decontaminate N95 respirators exposed to the influenza virus.<br /> The upper limit for repeated disinfection cycles is set by physical weakening of the N95 mask material (tears easily) and not by a loss in filtration capacity.<br /> The respirator straps retained most of their strength; weakening of the body of the N95 mask is the limiting factor in UVGI and not the weakening of the straps.<br /> <br /> == hydrogen peroxide sterilization ==<br /> <br /> The hydrogen peroxide sterilization protocol:<br /> decontaminated N95 respirators over 50 cycles, limited by the elastic straps showing degradation.<br /> disperse 480+ppm Hydrogen Peroxide vapor, gassing for 25 minutes and dwell for 20 minutes. Then introduce fresh air, and wait for 4 hours for the hydrogen peroxide to convert into oxygen and water.<br /> <br /> == Fabric face mask sterilization ==<br /> <br /> &quot;Cloth or fabric face masks for home use can be sterilized by washing them in the washing machine.&quot;<br /> -- https://www.cnet.com/how-to/homemade-face-masks-coronavirus-and-the-cdc-heres-everything-you-need-to-know/<br /> <br /> However, some people say this ruins the static electrical charge on the microfibers in N95 masks, making them much less effective.<br /> <br /> == heat sterilization ==<br /> https://www.vice.com/en_us/article/g5x9z7/the-guy-who-helped-invent-the-n95-mask-thinks-hes-found-a-way-to-clean-and-reuse-them<br /> <br /> <br /> == ultraviolet sterilization ==<br /> https://www.reddit.com/r/Coronavirus/comments/f45vkj/a_great_article_on_how_you_can_sterilize_a_n95/<br /> https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4699414/<br /> https://www.ncbi.nlm.nih.gov/pubmed/25806411<br /> https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4699414/<br /> https://www.ajicjournal.org/article/S0196-6553(18)30140-8/pdf<br /> https://www.peakprosperity.com/forum-topic/can-uv-light-disinfectant-box-kill-viruses-off-n95-mask/<br /> https://www.nebraskamed.com/sites/default/files/documents/covid-19/n-95-decon-process.pdf<br /> https://www.cdc.gov/niosh/nioshtic-2/20045956.html<br /> https://www.wbur.org/commonhealth/2020/03/27/umass-memorial-disinfects-masks-ultraviolet-light<br /> <br /> &quot;tabletop UVC germicidal light&quot;<br /> https://www.youtube.com/watch?v=aaVnAO1Vv-k<br /> <br /> <br /> == hydrogen peroxide sterilization ==<br /> https://www.safety.duke.edu/sites/default/files/N-95_VHP-Decon-Re-Use.pdf<br /> via<br /> https://www.cnn.com/2020/03/27/health/n95-respirator-rewear-coronavirus-duke-trnd/index.html<br /> https://hackaday.com/2020/04/02/fda-says-ppe-can-be-reused-after-trip-through-shipping-container-decontamination-system/<br /> <br /> &quot;Battelle Critical Care Decontamination System&quot;<br /> https://imgur.com/gallery/rVinlrX<br /> https://www.sages.org/publications/tavac/battelle-ccds/<br /> is a vaporized hydrogen peroxide system.<br /> <br /> <br /> <br /> == Related projects ==<br /> * [[Open source ventilator]]<br /> * [[Salvage Parts and Sources]]<br /> <br /> == Further reading ==<br /> <br /> * [https://en.wikipedia.org/wiki/Mechanical_filter_(respirator)#Disinfection_and_reuse Wikipedia: Mechanical filter (respirator): Disinfection and reuse]<br /> * [https://en.wikipedia.org/wiki/N95_respirator#Decontamination Wikipedia: N95 respirator: Decontamination]</div>

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