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What are the classifications and functions of masks

Update:03-11-2020
Summary:

Mask refers to a kind of equipment used to prevent the […]

Mask refers to a kind of equipment used to prevent the wearer from inhaling harmful components in the air. It can block smoke, vapor, gas, and suspended particles such as dust and airborne disease microorganisms.
Dust masks refer to disposable, relatively simple models. Some masks similar to dust masks also have special performance (filtration, internal leakage) certification, such as surgical masks used by medical staff and N95 masks that filter smoke. Surgical masks are mostly used by medical staff. They are mainly used to prevent the wearer’s respiratory secretions from contaminating others or the environment. They are also widely used to prevent the spread of respiratory infectious diseases such as severe acute respiratory syndrome and influenza. Dust masks are used in daily life in Asian cities to block smoke and dust.


Cotton/gauze mask: It can only filter larger particles. It can only be used during normal cleaning or when the patient does not have a surgical mask. It can reduce the amount of droplets coughed up. After use, block about 80% to prevent droplet infection. It also blocks 10%~20% of air pollution materials. The three-layer cloth mask contains non-woven fabrics, activated carbon or materials that can prevent PM2.5, which has high protection.
Paper mask: It can block more than 70% of 5 micron particles. If it is damaged or soiled, it should be replaced immediately. Suitable for daily cleaning.
Activated carbon mask: It can absorb organic gas and toxic dust. It has no bactericidal effect. It should be replaced immediately when it takes laborious breathing or cannot absorb peculiar smell. It is suitable for painting or spraying pesticides. After use, the effect of blocking droplet infection is 80%. And block 30%~80% of air pollutants and reduce odor
Surgical mask: It can block 90% of sub-micron particles. It should be replaced every day, but it should be replaced immediately if it is damaged or dirty. It is suitable for use when you have respiratory symptoms such as colds, fevers, coughs, etc., and when you go to hospital cinemas and other unventilated places. After use, the effect of blocking droplet infection is 90%. And block 30%~80% of air pollutants
N95 mask: It can block more than 95% of sub-micron particles and has high respiratory impedance. It is not suitable for ordinary people to wear for a long time, and repeated use should be avoided. And block 80%~99.97% of air pollutants
KF94 mask: can block more than 94% of sub-micron particles, and the respiratory impedance is lower than that of N95 mask
Three-dimensional masks: emerging masks with three-dimensional structure
PM2.5 anti-haze mask: can block particles with a particle size less than or equal to 2.5 microns in the air
Structure and material
The structure of the mask is generally divided into three layers. From outside to inside:
The first layer is a waterproof layer, the main purpose is waterproof. For surgical masks, this layer has the effect of preventing droplet contamination.
The second layer is the filter layer, the main purpose is to filter bacteria and droplets in the air.
The third layer is a water-absorbing layer, the main purpose is to absorb water.
Masks are generally made of non-woven fabrics. In addition to non-woven fabrics, there are activated carbon and paper.

Disposable Medical Mask

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