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Thu Mar 26, 2020, 07:50 PM

Stanford has done a study-released yesterday, about sterilizing masks.

https://stanfordmedicine.app.box.com/v/covid19-PPE-1-2

"In this materials science study of N95 face masks, two disinfection methods which do not reduce the filtration efficiency of the meltblown layer after an appreciable number of treatment cycles were found:
•Method 1: 75°C (158 degrees F) Hot Air (30 mins) for 20 cycles
•Method 2: UV (254 nm, 8W, 30 min) for 10 cycles. Steam treatment causes filtration efficiency to drop to ~85% after 5 cycles, and ~80% after 10 cycles."

I use my dryer shelf insert and use an infrared temp sensor. My dryer is an older Duet and I reach temps of 176 degree F in about 8 mins on the medium setting, which is supposedly a 32 minute cycle. Mine tends to shut off early so I go for 2 cycles.
Watch out for the metal nose bridge coming off. I re-glued one.

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Reply Stanford has done a study-released yesterday, about sterilizing masks. (Original post)
58Sunliner Thursday OP
Cracklin Charlie Thursday #1
58Sunliner Yesterday #5
littlemissmartypants Thursday #2
58Sunliner Yesterday #4
marble falls Yesterday #6
58Sunliner Yesterday #7
marble falls Yesterday #8
58Sunliner Yesterday #9
marble falls 20 hrs ago #10
sckarletmelanzana Yesterday #3

Response to 58Sunliner (Original post)

Thu Mar 26, 2020, 08:21 PM

1. I saw a story on my local fox affiliate this morning.

A local 3-D printing company is printing new masks that self seal, that have removable filters that can be replaced after sterilizing the mask body. I believe they worked with local (Kansas City) medical professionals on the design.

Remove mask, pop out old filter, sterilize, pop in new filter. Good to go.

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Response to Cracklin Charlie (Reply #1)

Fri Mar 27, 2020, 10:00 AM

5. I assume they still use the N95 filter. Kind of like a Vog mask, only a Vog has carbon cloth also.

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Response to 58Sunliner (Original post)

Thu Mar 26, 2020, 09:27 PM

2. From the article

Stanford infection control expertscurrently recommend four simple thingsto decrease your risk of transmission toindividuals in your home:
1. Wash your hands before you leave
work
2. Wash your hands when you gethome
3. Wear different shoes at home andat work, or wash your hands assoon as you take off your shoes. 4. Disinfect the common touchsurfaces in your home and in yourcar once each day. • Don't disinfect cutting boards or any item that comes into
contact with food


Don't disinfect cutting boards or any item that comes into
contact with food


Don't disinfect cutting boards...

That can't be right!!!

Someone needs to check with the authors on this point. I'm thinking this is a terrible mistake.

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Response to littlemissmartypants (Reply #2)

Fri Mar 27, 2020, 09:58 AM

4. That seems a little strange. I see it too.

Last edited Fri Mar 27, 2020, 11:20 AM - Edit history (3)

I sent an email asking them to clarify that.

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Response to littlemissmartypants (Reply #2)

Fri Mar 27, 2020, 11:03 AM

6. I've heard that if the concentration of certain sanitizers is too high it causes the virus to ...

harden rather than 'melt' and die.

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Response to marble falls (Reply #6)

Fri Mar 27, 2020, 11:10 AM

7. They don't use a sanitizer in the study. They specifically state that you should not use alcohol as

it disrupts the static charge on the fabric of the N95 mask.

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Response to 58Sunliner (Reply #7)

Fri Mar 27, 2020, 11:14 AM

8. I'm thinking of the cutting boards.

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Response to marble falls (Reply #8)

Fri Mar 27, 2020, 11:24 AM

9. Ok. But it seems like boiling water or a bleach solution and a rinse would work.

I sent her an email.

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Response to 58Sunliner (Reply #9)

Fri Mar 27, 2020, 03:53 PM

10. I agree.

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Response to 58Sunliner (Original post)

Fri Mar 27, 2020, 06:12 AM

3. great

this is good news

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