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How to make a decent mask - tested in Northern Italy   You are logged in as Guest
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Escribano

Posts: 6146
Joined: Jul. 6 2003
From: England, living in Italy

How to make a decent mask - tested i... 

To make a mask like the ones we are producing here.
It is pretty much based on this plan:

https://sarahmaker.com/how-to-sew-a-surgical-face-mask-for-hospitals-free-pattern/

You need to be ok with a sewing machine, or it is going to take a lot longer by hand.
Not supposed to be washable but I found no real evidence of degradation from washing and it should last a couple of months of regular wear.

We use close woven cotton from a sheet and sew in a Hepa filter (20x18 cm.) cut from these:

https://www.amazon.co.uk/gp/product/B079NKN5TG/

With the addition of Hepa, I measure (with a computerised laser particle sensor) around 80% efficiency (in the .3-.5 micron range of the coronavirus) compared to no mask and 40%-50% with just the plain cotton (no Hepa).

In addition, we sew in some thick electrical wire to bend over the bridge of the nose. Elastic is used for the ear loops.

Pleats point down and the mask is pulled snug, once in place, by tugging gently at the bottom. The elastic can be knotted to adjust fit.

I now use it when I go out in Northern Italy. It's better than pretty much anything outside of a clinical N95 mask. I hope this helps.







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  REPORT THIS POST AS INAPPROPRIATE |  Date Apr. 6 2020 12:14:36
 
El Burdo

 

Posts: 595
Joined: Sep. 8 2011
 

RE: How to make a decent mask - test... (in reply to Escribano

Amazed at your industry. You said you were in touch with someone over in the UK, I hope they can publicize this.

I've copied the text and links to my FB page. Hope that's OK.
  REPORT THIS POST AS INAPPROPRIATE |  Date Apr. 6 2020 15:42:25
 
Escribano

Posts: 6146
Joined: Jul. 6 2003
From: England, living in Italy

RE: How to make a decent mask - test... (in reply to El Burdo

quote:

I've copied the text and links to my FB page. Hope that's OK.


No problem and it is with my doctor friend in the UK too.

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  REPORT THIS POST AS INAPPROPRIATE |  Date Apr. 6 2020 16:45:54
 
RobF

Posts: 950
Joined: Aug. 24 2017
 

RE: How to make a decent mask - test... (in reply to El Burdo

quote:

I've copied the text and links to my FB page. Hope that's OK.


I’ve done the same with the pattern link. Thanks for sharing this, Simon.
  REPORT THIS POST AS INAPPROPRIATE |  Date Apr. 7 2020 16:56:23
 
Escribano

Posts: 6146
Joined: Jul. 6 2003
From: England, living in Italy

RE: How to make a decent mask - test... (in reply to RobF

Please note that the tightness of the cotton weave is an important factor. Maybe 30%-40% of the total efficiency.

Adding Hepa doubles efficiency

Make sure you read the instructions properly or you will end up with so much garbage.

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  REPORT THIS POST AS INAPPROPRIATE |  Date Apr. 7 2020 18:20:57
 
RobF

Posts: 950
Joined: Aug. 24 2017
 

RE: How to make a decent mask - test... (in reply to Escribano

Thanks Simon. I’ve updated my FB post intro to include that caution.
  REPORT THIS POST AS INAPPROPRIATE |  Date Apr. 7 2020 18:53:19
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