Spunbond fabric is used for the mechanical strength of the N95 mask, and meltblown fabric is used for particle filtration. These masks generally consist of 5 layers.
If we sort from outside to inside:
1st layer: 60 g / m2 spunbond fabric
2nd layer: 25 g / m2 meltblown fabric
Layer 3: Hot air cotton fabric
4th layer: 25 g / m2 meltblown fabric
5th layer: Lined as 35 g / m2 spunbond fabric.