There are two types of medical masks: one is a three-layer medical surgical mask, and the other is a five-layer medical N95 mask.
Both masks are composed of non-woven fabrics, the most important of which is the melt-blown non-woven fabric of the middle layer. Melt-blown non-woven fabrics block viruses and bacteria through the blocking effect of fibers and the electrostatic adsorption of fibers.
If we use water boiling, alcohol spray or ultraviolet lamp disinfection to sterilize the used mask, in theory, it can eliminate the bacteria and viruses sticking to the mask, but high temperature boiling and alcohol spray will destroy the fusion. Spray non-woven fabric fibers, so the function of the mask is reduced.
The fiber barrier and electrostatic adsorption of melt-blown non-woven fabric have a certain degree of saturation, to a certain degree, it will no longer have the role of adsorbing pathogens, so surgical masks generally need to be replaced for four hours, they must be replaced Too.
Under what circumstances do we consider reusing disposable medical masks? If patients with respiratory infectious diseases must go to the hospital for treatment and there is no new disposable mask, consider using disposable medical masks repeatedly. The purpose of reusing masks is to reduce the likelihood of these patients spreading droplets due to coughing or sneezing.