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The Water Cooler
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N95 mask cleaning ?
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<blockquote data-quote="yukonjack" data-source="post: 3347431" data-attributes="member: 2939"><p>Alcohol should NOT be used in cleaning the N95 masks.</p><p></p><p></p><p><a href="https://utrf.tennessee.edu/information-faqs-performance-protection-sterilization-of-face-mask-materials/" target="_blank">https://utrf.tennessee.edu/information-faqs-performance-protection-sterilization-of-face-mask-materials/</a></p><p></p><p><span style="font-size: 12px"><strong><strong>Q2: Can the masks be treated using alcohol?</strong></strong></span></p><p><strong>A: No.</strong> Face masks cannot be sterilized using alcohol because the charges will be erased by either alcohol liquid or its vapor, as described above.</p><p></p><p>My colleague Dr. Cai, a retired filtration testing scientist, collected experimental data in February 2020, shown in the table below, that support my past results.</p><p></p><p><strong>Table 1. Measured FE after treatment with alcohol and soap/water (Cai et al., Feb. 2020).</strong></p><p></p><p><strong>Treatment using alcohol or soap water</strong> <strong>FE</strong></p><p>Initial filtration efficiency (3-fold medical mask) 93.2%</p><p>After immersion in medical alcohol 67.0%</p><p>After treatment with saturated IPA vapor (ISO) 47.4%</p><p>After washing by hand with soap/water for 2 minutes 54.0%</p><p>The first web link in Q3 shows similar charge decay results after sterilization using alcohol.</p></blockquote><p></p>
[QUOTE="yukonjack, post: 3347431, member: 2939"] Alcohol should NOT be used in cleaning the N95 masks. [URL]https://utrf.tennessee.edu/information-faqs-performance-protection-sterilization-of-face-mask-materials/[/URL] [SIZE=3][B][B]Q2: Can the masks be treated using alcohol?[/B][/B][/SIZE] [B]A: No.[/B] Face masks cannot be sterilized using alcohol because the charges will be erased by either alcohol liquid or its vapor, as described above. My colleague Dr. Cai, a retired filtration testing scientist, collected experimental data in February 2020, shown in the table below, that support my past results. [B]Table 1. Measured FE after treatment with alcohol and soap/water (Cai et al., Feb. 2020).[/B] [B]Treatment using alcohol or soap water[/B] [B]FE[/B] Initial filtration efficiency (3-fold medical mask) 93.2% After immersion in medical alcohol 67.0% After treatment with saturated IPA vapor (ISO) 47.4% After washing by hand with soap/water for 2 minutes 54.0% The first web link in Q3 shows similar charge decay results after sterilization using alcohol. [/QUOTE]
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