combat wombat said:
The Ag engineer that showed how to make masks with air filters said you shouldn't use fiberglass media for these masks because you really don't want to risk getting fiberglass particles in your lungs.
They made their design out of a paper media vacuum bag. No inner material. Just the bag material only. We'll be careful, especially if it turns out to be spun fiberglass instead of spun poly.
ETA:Did a little digging and found out that
this filter is
made of fine carbon powder bonded to lofted polyester medium on a spun matrix. We'll still be super careful to keep the face area well protected.