import masks

import masks such as (N95 type particulate protective mask) generally refers to type mask masks are NIOSH ( National Institute for Occupational Safety Health certification of nine kinds of particles, National Institute for Occupational Safety and Health ) protective masks a medium of. 

is not a specific product name, as long as it meets the N95 standard, and the product passed the NIOSH review can be called the mask, which can filter particles with an aerodynamic diameter of 0.075µm ± 0.020µm.

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Chinese name KN95 type mask Foreign name N95 face-mask ( surgical masks ) Certification body NIOSH Category Protective mask Classification Cup cover type, folding type Features The filtration efficiency of particles with aerodynamic diameter of 0.075µm ± 0.020µm reaches more than 95%

table of Contents

1. 1 Brief introduction of N95 mask
2. 2 Function and use
3. 3 Common types
4. 4 safety standard

1. 5 Fitness test
2. 6 Dustproof and medical
3. 7 Precautions for use
4. 8 Performance limitations

1. 9 Mask selection
2. 10 Expert advice

Brief introduction of kN95 mask

KN95 mask is one of 9 types of particulate protection masks certified by NIOSH . “N” means not resistant to oil.

 “95” means that when exposed to a specified number of special test particles, the particle concentration in the mask is more than 95% lower than the particle concentration outside the mask. The 95% value is not the average value, but the minimum value. 

KN95 is not a specific product name, as long as it meets the KN95 standard, and products that pass NIOSH’s review can be called “KN95 masks.” 

The protection grade of KN95 means that under the test conditions specified in the NIOSH standard , the filtering efficiency of the mask filter material to non-oily particulate matter (such as dust , acid mist , paint mist, microorganisms, etc.) reaches 95%.

Surgical masks

The filtering efficiency of the surgical masks for particles with an aerodynamic diameter of 0.075µm ± 0.02µm is above 95%. 

The surgical masks diameter of airborne bacteria and fungal spores mainly varies between 0.7-10µm, which is also within the protection range of surgical masks

Therefore, the surgical masks can be used for the respiratory protection of certain particles, such as the dust generated by grinding, cleaning and processing of minerals, flour and certain other materials.

surgical masks It is also suitable for the liquid or non-oily generated by spraying. Particulate matter of harmful volatile gas. 

Can effectively filter and purify the inhaled abnormal surgical masks (except toxic gases), help reduce the exposure level of certain surgical masks microbial particulates (such as surgical masks , anthrax , tuberculosis, etc.), but it cannot eliminate contact infection, illness or death Risk ^[1] .

The U.S. Department of Labor has recommended that medical personnel use N95 masks to prevent microbial airborne diseases such as influenza and tuberculosis .

Common types

According to the shape of the mask, it is often divided into two types: cup and fold.N95 masks (2 photos)

safety standard

editNIOSH certified other anti-particulate mask

levels also include:

N95, N99, N100, R95, R99, R100, P95, P99, P100, a total of 9 kinds.

 These protection levels can cover the protection range of N95.”N” means not resistant to oil, suitable for non-oily particulate matter.”R” means resistant to oil, suitable for oily or non-oily particulate matter.

If used for the protection of oily particulate matter, the use time should not exceed 8 hours.”P” means oil proof, suitable for oily or non-oily particulate matter.

If used for oily particulate matter, the usage time should follow the manufacturer’s recommendations.”95″, “99” and “100” refer to the filtration efficiency level when tested with 0.3 micron particles. 

“95” means that the filtration efficiency is above 95%, “99” means

that the filtration efficiency is above 99%, and “100” means that

the filtration efficiency is above 99.7%.

Fitness test

import masks addition to the filtering efficiency of the mask,

the tightness of the mask and the face is one of the important

factors that determine the effectiveness of the mask.

Different types of masks have a big difference from the suitability of the human face. Therefore, before using the mask, the suitability of the mask should be checked first. 

After the wearer’s face tightness test, ensure that the air can enter

and exit through the mask when it is close to the edge of the face.

Dustproof and medical

deputy director of the Consumer Goods Industry

Department of the Ministry of Industry and Information Technology 

said at a press conference on the 2nd, import masks

Kn95 N95

KN95 N95 masks refer to masks with a filtration efficiency of 95%. They are divided into industrial dustproof and medical types .

 Medical N95 masks provide higher protection. ^[2]“Approaching the N95 Mask Production Line” reported: “Workers are packing medical N95 masks (photographed on February 8).

For the past few days, Hospitiol Medical Technology Co., Ltd.,

the only manufacturer of medical protection N95 masks in Liaoning

Continuous production for more than 20 hours per day, to ensure the

daily production capacity of more than 20,000 masks, to provide the epidemic

prevention line in Hubei Province and the epidemic prevention line in Liaoning Province.

” ^[3]The industrial dustproof N95 and KN95 are both non-oily particles, while the medical N95 is a medical protective mask (not only particles, but also body fluids, etc.). import masks (The picture of Xinhuanet in the appendix is ​​”N95″ under the words “Medical protective mask“).

SURGICAL MASK

surgical mask import masks to provide the epidemic

prevention line in Hubei Province and the epidemic prevention line in Liaoning Province.

” ^[3]The industrial dustproof N95 and KN95 are both non-oily particles, while the medical N95 is a medical protective mask (not only particles, but also body fluids, etc.). 

(The picture of Xinhuanet in the appendix is ​​”N95″ under the words “Medical protective mask”).

1. Wash your hands before wearing masks, or avoid touching your hands with the inside of the mask during masking to reduce the possibility of mask contamination.
2. Distinguish the inside, outside, top and bottom of the mask clearly.
3. Do not squeeze the mask by hand. N95 masks can only isolate the virus on the surface of the mask. If you squeeze the mask by hand, the virus will wet the mask with the droplets and it is easy to cause virus infection.
4. Try to make the mask and the face have a good adhesion. The simple test method is: after putting on the mask, exhale hard, and the air cannot leak from the edge of the mask.
5. The protective mask must be close to the user’s face, and the user must shave the beard to ensure that the mask can fit the face. The beard and anything between the mask seal and the face will cause the mask to leak.
6. After adjusting the position of the mask according to your face shape, use the index finger of both hands to press the nose clip along the upper edge of the mask to make it fit closely with the face ^[4] .

When the following conditions occur, the mask should be replaced in time:

1. the respiratory impedance increases significantly;
2. the mask is damaged or damaged;
3. When the mask and the face cannot be in close contact;
4. The mask is contaminated (such as blood stains or droplets)
5. The mask has been contaminated (has been used in individual wards or patients contacted);
6. If the mask contains activated charcoal and there is an odor in the mask;
7. When the mask is used longer than the recommended duration.

import masks

import masks from china the ordinary degreased gauze mask is not less than 17cm in length and 13cm in width The number should not be less than 12 floors. 

Another thing to remind everyone is that if you choose a medical mask, you must remember to have a nose clip, which is made of bendable plastic material and has a length of not less than 8.5cm.

1. Infectious diseases of the respiratory tract are not only transmitted through the respiratory tract;
2. Preventive measures should precede exposure;
3. The tight structure of the mask and high-efficiency filtration will increase breathing resistance and reduce comfort;
4. If the mask design is not suitable for the user’s face shape, it will affect the suitability and will cause leakage;
5. Under the requirements of suitability and correct use, protective masks can effectively reduce the concentration of harmful substances by 90%;
6. The government has not established safe exposure limits for pathogenic microorganisms. Respiratory protection can only reduce the risk of illness, but it cannot eliminate the risk.

import Masks selection

1.  On special occasions, such as visiting a doctor and visiting a patient, it is best for ordinary citizens to choose medical masks or import masks .
2. import masks Choose a qualified mask When choosing a mask, it depends on whether there is a trade name on the package, whether there is information on the manufacturer or supplier, whether there is a mask certificate or instructions for use. 
3. Disposable masks must also have a one-time mark, and the method of sterilization must be marked for reusable medical protective masks . In general, ordinary gauze masks must indicate whether they are ordinary or disinfected. 
4. The materials used in the masks should be free of odors and harmless to the human body, especially the parts of the human face that are in contact with the face should be non-irritating and allergenic.
5. import masks Choose a mask and do n’t forget to check the appearanceThis is a problem that is easy to ignore when we choose a mask.  There should be no holes or stains on the surface of the mask. Medical protective masks should not have an exhalation valve. 
6. For close-fitting arched masks, the transverse diameter is not less than 14cm and the longitudinal diameter is not less than 14cm; the medical protective rectangular mask is not less than 17cm in length and the width is not less than 17cm;
7. the ordinary degreased gauze mask is not less than 17cm in length and 13cm in width The number should not be less than 12 floors. 

Expert advice

But for N95 masks, the doctor reminded the public to note: “In theory, the more closed the protective material of the mask, the better the effect of blocking particles. Conversely, the more closed the mask, the harder it is to breathe, especially for patients with cardiovascular disease Poor wearing may also cause dizziness and breathing difficulties due to lack of oxygen , so choose it more carefully. “