Can N95 masks be washed?
May 29, 2025
Source: Cainiu Health
Dr. Wang Lei
Introduction
Under normal circumstances, N95 masks cannot be washed. N95 masks are mainly composed of non-woven fabric, melt-blown fabric, a nose clip, and ear loops. The protective mechanism of N95 masks relies on their special structure and electrostatic adsorption capability. The melt-blown fabric layer in the middle of the mask carries an electrostatic charge, which can adsorb tiny particles in the air, such as droplets and viruses, thereby achieving highly effective filtration.
Under normal circumstances, N95 masks cannot be washed. The detailed explanation is as follows:
N95 masks are mainly composed of non-woven fabric, melt-blown fabric, nose clip, and ear loops. The protective mechanism of N95 masks relies on their unique structure and electrostatic adsorption capability. The middle layer of melt-blown fabric in the mask carries an electrostatic charge, which can adsorb tiny particles in the air such as droplets and viruses, thereby achieving highly effective filtration. Once washed, whether with water or cleaning agents, the electrostatic adsorption capability of the melt-blown fabric will be compromised, significantly reducing the mask's filtration efficiency and its ability to provide effective protection.
The cleaning process may also damage other components of the mask. For example, the shape of the mask that conforms to the face may be altered. N95 masks are rigorously designed and tested, and the fit against the face is crucial for preventing pollutants from entering through the edges of the mask. After washing, the mask may no longer fit tightly against the face, leading to air leakage and exposing the wearer to a contaminated environment.
Whether washed or not, N95 masks should be replaced after being worn continuously for a certain period to maintain their protective effectiveness.
