Homemade Covid 19 mask patterns and resources?

[ctwo]

Here is a freedom bandanna, unscented Swiffer, Kirkland paper towel, Kirkland TP, Marathon TP.

Edit: the red square is ~100 micrometers. Coronavirus is about 0.1 micrometer. Each image pixel (or each black dot in the red square) is ~400 coronaviruses, and the red square is ~1 million coronaviruses.

 

[Climber]

It'd be cool to have an N95 mask at same magnification for reference, densest layer since they are multi-layer.

Still, cool pics :thumbup

 

[Dr_SLO]

Here is freedom bandanna, unscented Swiffer, Kirkland paper towel, Kirkland TP, Marathon TP.

Cool pictures! What magnification were those taken at?

 

[bojangle]

It'd be cool to have an N95 mask at same magnification for reference, densest layer since they are multi-layer.

Still, cool pics :thumbup

I found this.

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

https://m.facebook.com/admatelofficial/posts/2644295125608107

 

[ctwo]

I put a scale on the images. See my post above.

 

[Dr_SLO]

I put a scale on the images. See OP.

Thanks for doing that. It looks like the Kirkland paper towel is the way to go. Still, lots of holes in the 50-100 micron range.

 

[ctwo]

It'd be cool to have an N95 mask at same magnification for reference, densest layer since they are multi-layer.

Still, cool pics :thumbup

Would need a better microscope to see the important bits. Followup to the video posted earlier with a source of material.


youtu.be/3XE3OgcgXyE

 

[Climber]

Would need a better microscope to see the important bits. Followup to the video posted earlier with a source of material.


youtu.be/3XE3OgcgXyE

Yeah, I watched the video. Thanks for posting it! :thumbup

There are 8 covid19 nurses in Santa Monica who were sent home (probably without pay) for refusing to enter rooms with covid19 patients because the hospital would only give them surgical masks to work with while supplying N95 masks to other employees in the hospital. Stupid and undefendable action by the administrators, it's very likely that they'll be facing a big lawsuit that they won't win.

 

[900ss]

DR SLO, is there a particular type of homemade mask that is preferred by medical or scientific professionals?

Thank you for all your informative posts. :thumbup

 

[900ss]

Ctwo, do you have any Scott paper shop towels, the blue ones from Costco or O'Reilly? I would be interested to see the weave and gaps in that material.

 

[ctwo]

Ctwo, do you have any Scott paper shop towels, the blue ones from Costco or O'Reilly? I would be interested to see the weave and gaps in that material.

I don't have that brand, but I do recall buying a knock-off brand at harbor freight. I've not seen the roll in a long time though.

I will say that when I put two layers of paper towel in one of those rubber canister masts, it's a bit hard to breathe through. I've heard that of N95 masks (respirators) too. So I figure for the kind of mask we'd make at home, too much restriction would just have most of your breath going around the gaps or edges.

 

[Dr_SLO]

DR SLO, is there a particular type of homemade mask that is preferred by medical or scientific professionals?

Thank you for all your informative posts. :thumbup

I don't know of any preferred methods of homemade masks that medical or scientific professionals use. In my opinion, unless its of surgical mask or N95 grade droplets and aerosols are not going to be filtered out of the air. Bare in mind that surgical and N95 masks are not 100% effective in healthcare settings; they're designed to reduce viral load.

Masks made from material like bandanas and T-shirts aren't going to do much. Ctwo's helpful microscopy shows why; the holes are just too big to stop droplets (around 5 microns) and aerosols (<4 microns) that contain virus. Droplets will not get stuck to the material because the airflow will be greatest at the holes in the material. Also, because clothing based-materials are woven the holes will be evenly spaced. For effective filtration a tortuous path is needed much like the paper tissue in Ctwo's images.

The other issue with masks, as has been mentioned before, is appropriate use. From what I've seen out and about people don't generally know how to use a mask. My favourite so far was an individual who's job it was to marshal people into a store. They were using a cloth type mask and kept pulling it down to talk and then hand baskets to folk. Completely useless and, if infected, contaminating the baskets they were handing out.

 

[900ss]

Hello Stefan:

Thank you for the response, and for all of your informative posts.

My younger sister works at Kaiser in Stockton, but not in a medical capacity.
She and other staff members have been told that in the absence of self-purchased N95 or surgical masks, they must use a home-made mask of some sort. I have been prototyping various designs at home that include a secondary filter pocket, and have settled on one that achieves a pretty good fit all around. I do realize the effectiveness is not that good.

Take care!

I don't know of any preferred methods of homemade masks that medical or scientific professionals use. In my opinion, unless its of surgical mask or N95 grade droplets and aerosols are not going to be filtered out of the air. Bare in mind that surgical and N95 masks are not 100% effective in healthcare settings; they're designed to reduce viral load.

Masks made from material like bandanas and T-shirts aren't going to do much. Ctwo's helpful microscopy shows why; the holes are just too big to stop droplets (around 5 microns) and aerosols (<4 microns) that contain virus. Droplets will not get stuck to the material because the airflow will be greatest at the holes in the material. Also, because clothing based-materials are woven the holes will be evenly spaced. For effective filtration a tortuous path is needed much like the paper tissue in Ctwo's images.

The other issue with masks, as has been mentioned before, is appropriate use. From what I've seen out and about people don't generally know how to use a mask. My favourite so far was an individual who's job it was to marshal people into a store. They were using a cloth type mask and kept pulling it down to talk and then hand baskets to folk. Completely useless and, if infected, contaminating the baskets they were handing out.

 

[Archimedes]

I don't know of any preferred methods of homemade masks that medical or scientific professionals use. In my opinion, unless its of surgical mask or N95 grade droplets and aerosols are not going to be filtered out of the air. Bare in mind that surgical and N95 masks are not 100% effective in healthcare settings; they're designed to reduce viral load.

Masks made from material like bandanas and T-shirts aren't going to do much. Ctwo's helpful microscopy shows why; the holes are just too big to stop droplets (around 5 microns) and aerosols (<4 microns) that contain virus. Droplets will not get stuck to the material because the airflow will be greatest at the holes in the material. Also, because clothing based-materials are woven the holes will be evenly spaced. For effective filtration a tortuous path is needed much like the paper tissue in Ctwo's images.

The other issue with masks, as has been mentioned before, is appropriate use. From what I've seen out and about people don't generally know how to use a mask. My favourite so far was an individual who's job it was to marshal people into a store. They were using a cloth type mask and kept pulling it down to talk and then hand baskets to folk. Completely useless and, if infected, contaminating the baskets they were handing out.

Someone needs to print this up and post it one the inside of every American's eyelids. This fascination with making totally useless homemade masks is moronic.

 

[Climber]

Someone needs to print this up and post it one the inside of every American's eyelids. This fascination with making totally useless homemade masks is moronic.

If these homemade masks are even reducing the amount of material going into the air by 50%, then they are accomplishing something.

If they are reducing the velocity of these particles sufficient to shorten the distance of travel, then they are accomplishing something.

I think that calling them 'totally useless' is not accurate, especially if they're using some of the less porous materials.

 

[Archimedes]

If these homemade masks are even reducing the amount of material going into the air by 50%, then they are accomplishing something.

If they are reducing the velocity of these particles sufficient to shorten the distance of travel, then they are accomplishing something.

I think that calling them 'totally useless' is not accurate, especially if they're using some of the less porous materials.

But they're not. The virus particles are going right through them. If you're breathing, it's passing right through.

 

[Climber]

But they're not. The virus particles are going right through them. If you're breathing, it's passing right through.

So you think that the virus organisms are just floating around in your lungs waiting to get breathed out?

Or are they contained in saliva and other collections of tiny globs of liquid and get expelled out with each breath?

The distinction is an important one.

 

[Dr_SLO]

Hello Stefan:

Thank you for the response, and for all of your informative posts.

My younger sister works at Kaiser in Stockton, but not in a medical capacity.
She and other staff members have been told that in the absence of self-purchased N95 or surgical masks, they must use a home-made mask of some sort. I have been prototyping various designs at home that include a secondary filter pocket, and have settled on one that achieves a pretty good fit all around. I do realize the effectiveness is not that good.

Take care!

You're welcome. A secondary filter in the pocket and a good fit will help improve effectiveness. Good luck.

 

[Dr_SLO]

So you think that the virus organisms are just floating around in your lungs waiting to get breathed out?

Or are they contained in saliva and other collections of tiny globs of liquid and get expelled out with each breath?

It's unlikely to be individual virus particles but droplets of 5 microns that are easily produced when talking; the louder the voice the increased frequency of droplets. Remember the choir singers? There's also aerosol (<4 microns) but these are likely less often produced. Anything of 5 microns or less is going to require a paper filter. Not using a paper filter would be like using fabric to replace the air filter in a motorcycle; it's the same principle except the mouth and nose are going to be sucking in the air, which will reach high velocities at the surface of the weave in the fabric.

A quick bit of shady maths; a 5 micron droplet has a volume of ~65 micrometers cubed. A coronavirus particle is ~0.0042 micrometers cubed, which means there will be ~10,000 virus particles per droplet assuming that the droplet only contains virus particles. That's a massive over simplification and is probably more along the lines of 10-1,000 particles per droplet. It's estimated that about ~1,000 particles are needed for infection so not many droplets are needed to initiate an infection. That's why it takes about 30 minutes (very approximate) of sitting in an enclosed space with an infected person for transmission to occur. The droplets and aerosols float around on the air currents in the room, droplets less so that aerosols.

EDIT: Corrected for grammar and the "<" for aerosol.

 

[Climber]

It's unlikely to be individual virus particles but droplets of 5 microns that are easily produce when talking; the louder the voice the increased frequency of droplets. Remember the choir singers? There's also aerosol (>4 microns) but these are likely less often produced. Anything of 5 microns or less is going to require a paper filter. Not using a paper filter would be like using fabric to replace the air filter in a motorcycle; it's the same principle except the mouth and nose are going to be sucking in the air, which will reach high velocities at the surface of the weave in the fabric.

A quick bit of shady maths; a 5 micron droplet has a volume of ~65 micrometers cubed. A coronavirus particle is ~0.0042 micrometers cubed, which means there will be ~10,000 virus particles per droplet assuming that the droplet only contains virus particles. That's a massive over simplification and is probably more along the lines of 10-1,000 particles per droplet. It's estimated that about ~1,000 particles are needed for infection so not many droplets are needed to initiate an infection. That's why it takes about 30 minutes (very approximate) of sitting in an enclosed space with an infected person for transmission to occur. The droplets and aerosols float around on the air currents in the room, droplets less so that aerosols.

So what you're saying is that a homemade mask with some kind of tighter weave of paper or similar will noticeably reduce the amount of virus-carrying particles out into the aire.

But, just cloth, even when doubled up will have little impact on the volume and velocity of virus-carrying particles going out into the air around the people using them?