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COVID-19 Emergency - Using UV Lamps to sanitize Face Masks overnight

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jeremy:
See https://www.nebraskamed.com/sites/default/files/documents/covid-19/n-95-decon-process.pdf

And https://m.box.com/shared_item/https%3A%2F%2Fstanfordmedicine.app.box.com%2Fv%2Fcovid19-PPE-1-1

Stanford research article very clearly and explicitly states: “DO NOT use alcohol or chlorine based disinfection methods” for mask disinfection.

NiHaoMike:


--- Quote from: Zero999 on March 27, 2020, 09:13:51 am ---I'd hope a decent oven will be able to leaven bread, on its lowest setting, without killing the yeast.

--- End quote ---
Bread dough contains a significant amount of water that allows it to survive a lot of overshoot just fine. Plastics, especially thin plastics, overheat easily as often seen happening from those trying to use a kitchen oven to dry 3D printing filament.

Stray Electron:

--- Quote from: Zero999 on March 26, 2020, 01:33:56 pm ---

I wonder how good the cheap LED germicidal lamps are? The blurb for the one linked below says it doesn't produce any ozone, so no good for masks, as it'll only sterilise the surface. It's inexpensive, considering the price of discrete UVC LEDs from reputable distributors. I accept distributors have lots of overheads, but I'm cynical of really cheap things.
https://www.amazon.com/dp/B085VWPT9C/ref=psdc_2314207011_t1_B085CGGQFR

--- End quote ---


    FYI.  Germicidal lamps emit 254nm UVC radiation. Usually they are mercury lamps and mercury emits both 254nm and 185nm radiation. the 185nm radiation is what generates ozone and the 254nm is what directly kills viruses. However some germicidal lamps use a doped envelope (aka bulb) that block 185nm so those lamps do not generate ozone. A moral of the story is that if you want ozone then make sure that you use a lamp that doesn't have a doped envelope.   Depending on the doping agent, the envelope on a doped lamp may have a greenish cast to it if you look at it in daylight.

Stray Electron:

--- Quote from: profdc9 on March 26, 2020, 01:10:50 pm ---Alcohol unfortunately can not be used to disinfect masks.  It destroys a charged layer in the N95 masks that attracts virus particles.

--- End quote ---

   Dan,  a few questions. Is that true of all types of alcohol?  Also couldn't "alcohol" still be used to disinfect the non-N95 masks?  The charged layer is activated charcoal isn't it?  If so could the alcohol be baked or live steamed out of the charcoal layer? (Live steam is what is used to "activate" charcoal.)

Mechatrommer:

--- Quote from: NiHaoMike on March 28, 2020, 12:00:35 am ---Plastics, especially thin plastics, overheat easily as often seen happening from those trying to use a kitchen oven to dry 3D printing filament.

--- End quote ---
have you done that? looks like you experienced. i did it and yes the old filament stock i tried to dry sagged quite badly but not it become unusable (setting is something like 100degC iirc). the next roll i dried i reduced setting to 60degC and it works. filament brittleness gone and become usable again. for things like paper, tissue, mask etc... i dont think they will combust at 100degC, even if overshooted to say like 150degC.

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