What does "N95" mask mean? Can N95 mask effectively prevent new coronavirus?

N95 respirator is one of nine NIOSH certified particle respirators. "N" means not resistant to oil. "95" means that the particle concentration in the mask is more than 95% lower than that outside the mask when exposed to a specified number of special test particles. 95% is not the average, but the minimum.

Is N95 a specific product?

N95 is not a specific product name. As long as the product meets N95 standard and passes NIOSH review, it can be called "N95 mask". The degree of protection is N95, which means that under the test conditions specified in NIOSH standard, the filtering efficiency of the filter material of the mask for non oily particles (such as dust, acid mist, paint mist, microorganism, etc.) reaches 95%.

What pollutants does N95 mask work on?

The filtration efficiency of N95 respirator for particles with aerodynamic diameter of 0.075 μ m ± 0.02 μ m is over 95%. The aerodynamic diameter of airborne bacteria and fungal spores mainly varies between 0.7-10 μ m, which is also within the protection range of N95 respirator. Therefore, N95 respirator can be used for respiratory protection of some particles, such as dust generated in the process of grinding, cleaning and handling minerals, flour and some other materials. It can also be used for liquid or non oil particles that do not produce harmful volatile gases due to spraying. It can effectively filter and purify the abnormal smell inhaled (except toxic gas), help reduce the exposure level of some inhalable microbial particles (such as mold, anthrax, tuberculosis, etc.), but it does not eliminate the risk of contact infection, disease or death.

What is the suitability test of N95 mask?

In addition to the filtering efficiency of N95 mask, the tightness between mask and face is one of the important factors determining the use effect of mask. Different types of mask have great differences in the suitability with human face. Therefore, before using the mask, the suitability test of the mask should be carried out first. When testing the tightness of the wearer's face, make sure that the air can pass through the mask when it is close to the edge of the face.

Wash your hands before wearing the mask, or avoid touching the inner side of the mask during wearing, so as to reduce the possibility of contamination of the mask.

Distinguish the inside and outside, up and down of the mask.

Do not use your hands to squeeze the mask. N95 mask can only isolate the virus on the surface of the mask. If you use your hands to squeeze the mask, the virus will soak through the mask with the droplets, which is easy to cause virus infection.

Try to make the mask and face have a good fit. The simple test method is: put on the mask, exhale hard, air can not leak from the edge of the mask.

The protective mask must be close to the user's face, and the user must shave off his beard to ensure that the mask can close to the face. The beard and anything between the mask gasket and the face will cause the mask to leak.

After adjusting the position of the mask according to the face shape, press the nose clip along the upper edge of the mask with the index finger of both hands to make it close to the face.

When should the N95 mask be replaced in time?

At present, the price of masks is expensive and the supply is in short supply. In the following cases, the masks should be replaced in time:

When respiratory impedance increased significantly;

When the mask is damaged or damaged;

When the mask and the face cannot fit tightly;

The mask is contaminated (such as blood stains or droplets, etc.);

The mask has been contaminated (used in individual ward or patient contact);

If the mask contains activated carbon, there is peculiar smell in the mask;

When the use time of the mask exceeds the recommended time, it shall be replaced in time.

What are the performance limitations of N95 face mask?

Respiratory infectious diseases are not only transmitted through the respiratory tract;

Preventive measures should precede exposure;

The close structure and high efficiency filtration of the mask will increase the respiratory resistance and reduce the comfort;

If the mask design is not suitable for the user's face shape, it will affect the suitability and cause leakage;

In order to meet the requirements of suitability and correct use, the protective mask can effectively reduce the concentration of harmful substances by 90%;

The government did not establish safe exposure limits for pathogenic microorganisms, respiratory protection can only reduce the risk of disease, but not eliminate the risk.

What are the risks of wearing N95 masks?

N95 face mask can achieve 95% filtering effect. But for the N95 mask, the doctor reminded the public to pay attention: "in theory, the more airtight the protective material of the mask, the better the effect of blocking particles. Conversely, the more airtight the mask is, the more difficult it is to breathe. Especially for patients with cardiovascular disease, wearing it badly may also cause dizziness and dyspnea due to lack of oxygen. It is more prudent to wear it. "

Can N95 mask effectively prevent new coronavirus?

We think so.

"supplied by gmtlight"