There are several types of secondary masks, non-medical masks and medical masks. In general, the protection of the former is relatively weak, and the protection of the latter is better. Wearing a disposable mask can effectively reduce the aerosol and dust in the air. , Smoke, mist, poisonous gas and poisonous vapor are adsorbed by the filter material and directly blocked from outside without being inhaled.
Of course, there are many types of medical masks. Common medical masks are divided into disposable non-woven masks, gauze masks, and special anti-virus masks. The first layer has three layers, which can isolate bacteria and dust, and because it is a one-time use, it is relatively safe and reliable.
The second type of gauze mask is also the most widely used and most widely used product at present, whether in the field of medical care or scientific research.
Anti-virus masks are mainly made of special materials with a filter layer in the middle. Generally, the filter layer uses activated carbon felt or melt-blown cloth. It has the effect of sterilization and sterilization
