Can I Use a Polypropylene Bag for DIY Face Mask to Fight COVID-19?

The good breathability of polypropylene bags means they can be layered up to make more effective DIY masks, although they still do not come close to the performance of a surgical mask.

We measure the ability of the polypropylene bag and other materials to capture 0.3 micron particles and 1 micron particles. The COVID-19 coronavirus measures 0.06-0.14 microns by itself and 5-10 microns when in water droplets.

1 layer: able to capture 22% of 0.3 micron particles, and 42% of 1.0 micron particles;

2 layers: able to filter 34% of virus-sized particles;

3 layers: able to filter  57% of virus-sized particles.

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