[stubish]

> Why are all the masks single use? Why can't we make reusable masks that can be disinfected by UV light?

There has been no incentive for reusable masks. By not reusing the mask, there is zero chance of it transmitting infection to other patients. The policy makes sense if you are rich and not having a shortage. Hopefully the hospitals have been smart enough to not incinerate the used masks, because even recycled ones are better than a handkerchief.

[fma]

When a mask gets saturated from moisture of your breath, it loses its effectiveness. That's why they are rated for 4 hours.

UV light can breakdown material.