ear loop

How 3-ply Procedural Masks Work The design of the procedural masks (often referred to as “surgical” masks) depends on the mode; usually, the masks are three-ply (three layers). This three-ply material is made up of a melt-blown polymer, most commonly polypropylene, placed between the non-woven fabric. The melt-blown material acts as the filter that stops microbes from entering or exiting...