Outer layer of disposable medical mask serves as a barrier to repel water, droplets, and other fluids

Disposable medical masks are commonly composed of three layers of non-woven fabric, with each layer serving a specific purpose.medical masks are typically made of three layers of non-woven fabric, with the outer and inner layers being hydrophobic, and the middle layer acting as a filter.The outer layer of a disposable medical mask is typically made of a hydrophobic (water-repellent) material. It serves as a barrier to repel water, droplets, and other fluids, thereby helping to prevent the penetration of potentially infectious particles from the outside.

The hydrophobic property of the outer layer is essential in blocking large droplets and splashes that may contain bacteria, viruses, and other harmful agents. When someone wearing a mask coughs, sneezes, or talks, respiratory droplets containing these particles can be released into the air. The hydrophobic outer layer acts as a shield, preventing these larger droplets from coming into contact with the inner layers of the mask, which are responsible for filtration and absorption.

By preventing the penetration of external fluids, the outer layer also helps to keep the middle filter layer dry, maintaining its filtration efficiency. A wet mask is less effective in filtering particles and may compromise its ability to protect the wearer and others.