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In the US, in order for a mask to be labeled "medical", that mask must be approved by the FDA as a medical device. With so many new people manufacturing masks coupled with the public demand for masks, it is likely not profitable to delay to seek FDA approval. The FDA also is unlikely to approve a new manufacturer's mask without ASTM testing. Thus, ...


8

DIY Designs - most do not carry efficacy data claims Note that many of these are only respiratory protection designs. You also need to protect your eyes in a high risk situation eg. looking after an infected relative. Get protective goggles or your own glasses and attach a plastic shield eg. plastic pamphlet holder to the glasses for a full face shield. ...


5

This is an early paper on the efficiency of different fabrics for virus filtration. (Lots of testing as gone on since then.) However, it nicely illustrates breathability, the other factor to consider when making a mask: They summarize nicely here: Although the dish towel and the vacuum bag captured the most particles, they were also the hardest to breath ...


4

Shop-vac, a major manufacturer of HEPA material strongly advises against using their vacuum bags to make a filter First, the filter materials used in the vacuum cleaners are for no purpose other than to protect the end users of Shop Vac products from particles or debris being expelled back into the ambient air during operation. They are in no way designed ...


3

Typically for an N95 mask to be considered "medical grade" it must be compatible with a sterile environment, such as by filtering both inhaled and exhaled air. Surgical masks provide some filtration of exhaled air, which is why they're useful in surgury (e.g. keep saliva off an operating region). I have an N95 mask advertised for environments with ...


3

Those are face shields to prevent primarily droplets reaching the eyes, and are worn as being more comfortable than goggles to protect the mucous membranes of the eyes, and they don't fog up like goggles can. However, they don't protect against droplet nuclei which float in the air, and there is no regulated design. Face shields are PPE that are commonly ...


2

To partly answer my own question, after trying quite a few different potential keywords for these shields, I did find one 2014 paper Efficacy of face shields against cough aerosol droplets from a cough simulator Health care workers are exposed to potentially infectious airborne particles while providing routine care to coughing patients. However, much is ...


2

Any component of PPE is a part of a whole and the protection one gets relates to the environment where one is working. One component doesn't work without the other. A face shield reduces the amount of virus that then has to get past air tight goggles and a respirator. If a person is in close contact with an infected person then the shield will stop large ...


2

There is literature to support that wearing a mask decreases transmission of infection ([Leung, N.H.L., Chu, D.K.W., Shiu, E.Y.C. et al. Respiratory virus shedding in exhaled breath and efficacy of face masks. Nat Med 26, 676–680 (2020).1), however, there is exceedingly limited evidence that wearing an improvised mask is anywhere near as effective as ...


2

Here is a relevant link on the best materials to use in creating a handmade face mask: https://www.cambridge.org/core/journals/disaster-medicine-and-public-health-preparedness/article/testing-the-efficacy-of-homemade-masks-would-they-protect-in-an-influenza-pandemic/0921A05A69A9419C862FA2F35F819D55 Also, here is relevant study on the effectiveness of a ...


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Particle Size-Selective Assessment of Protection of European Standard FFP Respirators and Surgical Masks against Particles-Tested with Human Subjects The tested FFP respirators and SMs in this study were observed to have the worst protection against particles between 0.263 and 0.384 μm. The protection factors of FFP respirators against particles in the ...


1

The mask protects people from the person wearing the mask. In surgery, my colleagues and I wear a mask to protect the patient's open wound from me. Do not make the mistake of thinking that you, as the mask wearer, are conferring a degree of protection that provides safety.


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In a scenario of being forced to choose from DIY designs (yikes!): Perhaps understanding: How are masks tested for efficacy? would provide insight into comparing DIY mask designs. Efficacy Test example: https://www.astm.org/Standards/F2101.htm Possible Mask features that drive efficacy: physical design: does the design effectively position the filter? ...


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