Face Mask Filter Material for mask construction. 7" width sold by the yard
"Spun bond" Inner & Outer Mask Layer - Washable - Polypropylene, 25 GSM
"Melt Blown" - Center Mask Material - Non-Washable - Polypropylene, BFE 99.5%, 30 GSM
"Spun Lace" Center Mask Material - Washable - Polyester, BFE 98.2%, 35 GSM
BFE - Bacterial Filtration Efficiency