What is the difference between N95 and ordinary medical masks?

What is the difference between N95 and ordinary medical masks? Let’s take a look today:

Disposable ordinary medical masks:
Disposable general medical masks are suitable for health protection in general medical environments where there is no risk of body fluids and splashes, suitable for general diagnosis and treatment activities, and for general low-flux and low-concentration pathogenic bacteria polluted environments.
Disposable medical masks can meet many of your requirements, but for ordinary people, you can achieve certain precautions by wearing disposable medical masks correctly when you go out.
Features: Compared with medical surgical masks and medical protective masks, the filtration efficiency of particles and bacteria is relatively low, but the filtration efficiency is higher than that of ordinary cotton spun masks in the society.
　　
Disposable medical surgical masks:
Disposable surgical masks are more suitable for preventing blood, body fluids and splashes during invasive operations. They are mainly used for the basic protection of medical staff and related personnel in medical institutions. General surgeons and medical staff in infection wards Need to wear this mask.
Main features: It is used to prevent blood, body fluids and splashes in invasive operations, and to protect respiratory diseases transmitted by droplets. It can prevent infectious agents (bacteria, viruses and other pathogenic microorganisms) with a diameter of less than 5 microns Wait).

N95 mask: certified by NIOSH in the United States, the filtration efficiency of non-oily particulate matter is ≥95%.
KN95 mask: It meets our China GB 2626 mandatory standard, and the filtration efficiency of non-oily particles is ≥95%.
　　
But what we need to know is that "the core standards of industrial masks and consumer product masks are actually the same. According to the GB2626 standard KN95, KN90 is actually sufficient, and medical personnel will have body fluids splashing and the environmental concentration is very high. It needs to be very strict.
　　
However, it should be noted that although some celebrity masks of the same style are more beautiful, they do not care about the protective effect. "The above-mentioned 3M technicians told a reporter from 21st Century Business Herald.
Regarding the issue of the frequency of mask replacement, the above-mentioned technicians said that if they are dirty, they will start to replace them, which lasts three to five days, or they need to be replaced when the medical staff goes to the contaminated area.
　　
In fact, regarding the frequency of replacement, at present, foreign countries, including WHO, have not had any clear conclusions on the wearing time of N95 masks, and my country has not made relevant regulations on the use time of masks.
　　
Related researchers have done relevant research on the protection efficiency of N95 medical protective masks and the wearing time. According to the relevant results, data shows that the filtration efficiency of N95 masks can still be maintained above 95% after wearing for 2 days, and the respiratory resistance does not change. Large; the filtration efficiency is reduced to about 94.7% after wearing for 3 days.