Why are you using this medical fabric? The Halyard H300-650 material has one layer (2-ply) specifications of filtering particles at 3 microns with >99.9% efficiency (high performance on Bacteria Filtration Efficiency BFE). They have been tested to filter particles <0.6micron with 80-90% filtration efficiency using the particle counter. Finally, they are highly splash resistant - with the capacity to withstand 90 cmH2O. These properties make this material ideal for DIY homemade masks. These masks should not be used to replace N95s - in terms of filtering capacity, they are superior to homemade cloth masks and some surgical face masks. Currently this is an off-label use of the sterilization wrapping.