All tested and approved face masks recommended for use during this pandemic are usually three ply ones, consisting of three individual layers:
1. Outer layer
A layer of non-woven fabric. This serves as a waterproof barrier that repels droplets and moisture expelled by people while talking, coughing, or sneezing.
2. Middle layer
Acting as filter, this layer is usually created from polypropylene (PP) melt-blown non-woven fabric. It has electrostatic properties which helps to trap aerosolised…