N95 mask disinfection

5,406 Views | 42 Replies | Last: 5 yr ago by fooz
94chem
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With the shortage of N95 masks, most citizens have either gone without, used a surgical type mask, or some other makeshift or home made solution. The limitation is that these makeshift masks do not prevent self exposure effectively, and even if an effective material with a good seal were designed (several are out there), the ability to re-use is questionable.

Cleaning with chemicals such as H2O2 or quaternary amines can be time consuming, compromise the mask integrity, leave hazardous chemical residue, or be ineffective.

If I am thinking about the problem correctly, what we need is a volatile antiviral that acts quickly, evaporates quickly, doesn't damage the material, and leaves no residue.

I was wondering about light hydrocarbons or even gases, such as ethylchloride, which got me wondering about dry cleaning fluid (tetrachloroethylene). I haven't found much on the web, but I did find this article from 1993, which states that TCE was ineffective for NON-ENVELOPED viruses. The coronavirus is enveloped, however, and I wonder if something volatile might disrupt/dissolve enough of the envelope to deactivate.

Here's the article:

https://pubmed.ncbi.nlm.nih.gov/8099924/

Apologies if this has already been discussed, or if it's already been disproven. Just thought it would be pretty easy to spray a little chloroethane, or even some methylene chloride on a mask.
ETFan
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What about ozone?
$3 Sack of Groceries
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30 mins in the oven at 160.
Google it.
Bobcat06
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Yelnick McWawa said:

30 mins in the oven at 160.
Google it.
This
kingj3
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Bleach water?
Stringfellow Hawke
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https://www.cdc.gov/coronavirus/2019-ncov/hcp/ppe-strategy/decontamination-reuse-respirators.html

Dry heat in an oven or autoclave not recommended due to mask degradation.
94chem
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Yelnick McWawa said:

30 mins in the oven at 160.
Google it.


Yes, I've seen this, and while I believe it will kill CV, I wonder about the integrity of the fibers.
Bobcat06
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It retains 97% filtration efficiency, better than all other methods.

https://stanfordmedicine.app.box.com/v/covid19-PPE-1-1
Rock1982
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Yelnick McWawa said:

30 mins in the oven at 160.
Google it.

160 F, LOL.
Tabasco
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Rock1982 said:

Yelnick McWawa said:

30 mins in the oven at 160.
Google it.

160 F, LOL.
great info. Would read again.
94chem
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Rock1982 said:

Yelnick McWawa said:

30 mins in the oven at 160.
Google it.

160 F, LOL.


160 F is more like a RonCo food dehydrator. Kinda gotta play games with an oven to keep around 160.
Tabasco
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94chem said:

Rock1982 said:

Yelnick McWawa said:

30 mins in the oven at 160.
Google it.

160 F, LOL.


160 F is more like a RonCo food dehydrator. Kinda gotta play games with an oven to keep around 160.
Never thought about dehydrator. I have one. Good idea actually.
goodAg80
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94chem
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Tabasco said:

94chem said:

Rock1982 said:

Yelnick McWawa said:

30 mins in the oven at 160.
Google it.

160 F, LOL.


160 F is more like a RonCo food dehydrator. Kinda gotta play games with an oven to keep around 160.
Never thought about dehydrator. I have one. Good idea actually.


Hehe. You're welcome. I once built a prototype for a commercial chemical plant using spare parts I found in my lab. Molecules are awesome. They even make me try engineering sometimes.
revvie
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Wonder if you can put mask(s) in Food Saver bag. Seal it. Use sous vide for 30 minutes at 160 degrees. Or has anyone heard about using CPAP SoClean to disinfect with ozone.
94chem
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revvie said:

Wonder if you can put mask(s) in Food Saver bag. Seal it. Use sous vide for 30 minutes at 160 degrees. Or has anyone heard about using CPAP SoClean to disinfect with ozone.


Over on the Food board they'll tell you how good they made it taste. The key is that you have to treat the bathwater with and pinch of sea salt before you lower the bag into the tub.
kingj3
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So, bleach water and mask integrity? Thoughts?
Bobcat06
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Bad.


[url=https://stanfordmedicine.app.box.com/v/covid19-PPE-1-1][/url]https://stanfordmedicine.app.box.com/v/covid19-PPE-1-1
Tabasco
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revvie said:

Wonder if you can put mask(s) in Food Saver bag. Seal it. Use sous vide for 30 minutes at 160 degrees. Or has anyone heard about using CPAP SoClean to disinfect with ozone.
reverse sear in an iron skillet before serving.
88planoAg
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Just leave it in the sun for awhile.
Fannie Luddite
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How about a microwave oven?

The lowest temp for my oven is 170F.
Bobcat06
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Does your mask have a metal nose clip? Probably shouldn't put that in the microwave

170 F is fine
Redassag94
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What about spraying alcohol from a spray bottle? If it is 80% concentrated.
Stringfellow Hawke
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TRADUCTOR
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Hydrogen Peroxide
LeisureSuitLarry
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Redassag94 said:

What about spraying alcohol from a spray bottle? If it is 80% concentrated.
This or how about wiping down with a cotton ball saturated with alcohol?
jwoodmd
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88planoAg said:

Just leave it in the sun for awhile.
For a very long time and then it's not for sure.

https://www.bbc.com/future/article/20200327-can-you-kill-coronavirus-with-uv-light
88planoAg
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jwoodmd said:

88planoAg said:

Just leave it in the sun for awhile.
For a very long time and then it's not for sure.

https://www.bbc.com/future/article/20200327-can-you-kill-coronavirus-with-uv-light



Interesting, thanks. I was going with early recommendations from doc rev.

Since I'm only going out about once a week, looks like it is best to just set it aside in between use and let time take care of it. (I found an open n95 mask in the garage used a long time ago for yardwork, so I can't wash it)
Duncan Idaho
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I built something similar to one of these.

https://makezine.com/projects/build-a-diy-uv-c-sterilization-cabinet-to-fight-covid-19/
claym711
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Know a surgical resident who swears N95 isn't necessary outside of medical settings......
Hammerheadjim
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most home remedy sterilization techniques may destroy the electrostatic charge the mask contains to repel particles.
Stupid@17
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If you have 7...have a bag for each that is marked. Put mask in bag. Retrieve 7 days later?
ETFan
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https://www.fda.gov/news-events/press-announcements/coronavirus-covid-19-update-fda-issues-second-emergency-use-authorization-decontaminate-n95

Quote:

The FDA granted an emergency use authorization to STERIS Corporation for the STERIS V-PRO 1 Plus, maX and maX2 Low Temperature Sterilization Systems using the STERIS N95 Decontamination Cycle (non-lumen cycle), which uses vaporized hydrogen peroxide. Hydrogen peroxide sterilization is a low temperature sterilization process that utilizes hydrogen peroxide vapor. The vapor fills the sterilization chamber, penetrates the device and sterilizes exposed surfaces. The STERIS V-PRO Decontamination Cycle is capable of processing 10 respirators at one time through a process that takes approximately 28 minutes to complete. Each respirator can be processed up to 10 times for single-user reuse.
TXTransplant
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law-apt-3g said:

Hydrogen Peroxide


This was on the Today Show this morning.

https://www.today.com/video/young-couple-creates-new-system-to-clean-and-reuse-n95-masks-82015813597?playlist=mmlsnnd_todayarchivestuesday
fooz
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When my masks come in I'll put it in my cpap cleaner.
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