Author Topic: Will painting respirators protect one from the COVID-19 virus?  (Read 2893 times)

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Offline KaneTW

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Re: Will painting respirators protect one from the COVID-19 virus?
« Reply #50 on: March 24, 2020, 02:27:54 pm »
These are dust masks, just for a finer grade of dust. Yes, the cheapest grade (FFP1, no idea what the US equivalent is) won't block enough. But most commonly used dust masks (at least in my experience) are N95.

N95 masks are rated for 0.3um, but Coronavirus nuclei are 0.1um-ish. The reason masks are still effective is that droplets containing viruses dry out to form larger particles, which are better filterable.

Respirators also have a non-trivial absorbance curve:

While 0.1um particles only have 95-98% efficiency, that's basically what the respirator is rated for anyway.
 

Online TerraHertz

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Collecting old scopes, logic analyzers, and unfinished projects. http://everist.org
 

Offline ConKbot

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Re: Will painting respirators protect one from the COVID-19 virus?
« Reply #52 on: March 28, 2020, 08:10:12 am »
What the fuck is this thread? A few factual posters and a truckload of unsubstantiated FUD.

A proper accredited by whatever local agencies (NIOSH/OSHA in the US) i.e. Just not whatever weird knockoff direct import shit Amazon has in stock. With appropriate filters will provide protection for you. For US folk, N95 is equivalent filtration (95% >0.3um, non-oily particles ) as the medical masks, but medical stuff is rated for liquid jets for the surgery theater.  P95 is the same, but oily particulate is acceptable. P100 filters capture 99.97% for the same particle sizes, and can handle oily particulate too. On respirator filters, N/P95 generally has time limits, P100 is generally until it's too much effort to inhale, then replace. But RTFM from your manufacturer.
With a good fit (in the US, if you're required to wear a respirator for work, you're gonna have to go to a work medical clinic for a fit check to select the appropriate size) and not being exposed arterial spray, a halfmask/P100 filters is going to absolutely provide you with better protection than a N95 disposable with questionable seal.
The obvious issues are cleaning a reusable device. It's not like they don't need to get cleaned and disinfected regularly in normal circumstances, just more-so now. Masks are made with silicone and polypropylene, it's not like its hard to clean them via immersion.  And secondly, the exhale valve obviously isn't filtered, so it's not providing protection from you to other people. However other folks whining and crying about that in here doesn't magically make disposables available, so if you have access to one but not the other, your decision is made.

Tldr: use the right filters, clean the mask frequently, know the outside and filters are "hot", a good fit is important, and if you are sick, then you aren't helping anyone else by wearing it, like a disposable would. Neither a disposable mask or reusable half mask respirator provide protection to your eyes, so mind that as you deem appropriate.
« Last Edit: March 28, 2020, 04:14:11 pm by ConKbot »
 
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Offline SiliconWizard

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Re: Will painting respirators protect one from the COVID-19 virus?
« Reply #53 on: March 28, 2020, 04:18:57 pm »
Neither a disposable mask or reusable half mask respirator provide protection to your eyes, so mind that as you deem appropriate.

You're raising a good point here. Whereas contamination through inhaling is a bit more likely (you're obviously force-feeding it through your nose), it can absolutely be through the eyes as well. A proper protection would include appropriate glasses. It's a particularly important point to keep in mind for anyone who would have to deal with someone infected.

 


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