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Recently, as epidemic continues to intensify, there are fewer and fewer N95 masks. I bought several masks and found that they passed GB2626. So what is relationship between GB2626 and N95?

1. Introduction to N95 masks

The N95 respirator is one of nine NIOSH (National Institute for Occupational Safety and Health) certified particulate respirators. "N" means not oil resistant. "95" means that when exposed to a certain number of special test particles, concentration of particles inside mask is more than 95% lower than concentration of particles outside mask. Among them, value of 95% is not average value, but minimum value. N95 is not a specific product name, as long as it meets N95 standard and passed NIOSH test, it can be called "N95 mask". The protection level N95 means that under test conditions specified in NIOSH standard, filtration efficiency of mask filter material for non-oily particles reaches 95%.

2. Function and use

N95 masks have a filtration efficiency of over 95% for particles with an aerodynamic diameter of ≥ 0.3 µm. The aerodynamic diameter of airborne bacteria and fungal spores mainly ranges from 0.7-10 µm, which is also within protection range of N95 masks. Thus, N95 respirators can be used for respiratory protection against certain particulate matter, such as dust generated during grinding, refining and processing of minerals, flour and some other materials, and are also suitable for liquid or non-oil spray respirators. harmful volatile gases. It can effectively filter and purify inhaled abnormal odors (except toxic gases) and help reduce exposure to certain respiratory microbial particles, but cannot eliminate risk of contact infection, illness, or death [1].

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

3. Expert advice

The best-selling N95 masks on Internet have been tested for 95% filtration efficiency. But regarding N95 masks, doctor reminded public: “Theoretically, more airtight protective material of mask, better particulate blocking effect. Conversely, more airtight mask, harder it is to breathe.” especially for patients with cardiovascular disease. If you don't wear it properly, you may suffer from dizziness and difficulty breathing due to lack of oxygen, so you should be more careful when wearing it."

4. Comparison of several national standards

(1) GB2626

Particulate respirator with self-priming filter, this standard applies to self-priming filter for protection against various types of particulate matter. Respiratory protection for operations, evacuation and fire fighting.

Test: 85 L/min, 0.075 µm NaCl aerosol, 0.185 µm oil particles, KN95 requires 95% salt particle resistance, excluding oil resistance. KP95 requires 95% oil resistance except for salt particles. Make one more point to prevent leakage when turning head, raising head, lowering head and talking

(2) GB 19083

Medical protective masks. This standard applies to medical protective masks with a self-priming filter that filter particulate matter in air and block droplets, blood, body fluids, secretions, etc. in medical work environment.

Test: 85 L/min, 0.075 µm NaCl aerosol, 95% filtration as a requirement. In addition, blood splatter cannot penetrate

(3) GB/T 32610

Protective masks for daily use. This standard applies to protective masks worn to filter particulate matter in polluted atmospheres in everyday life. This International Standard does not apply to respiratory protective equipment used in specialized industries such as hypoxic environments, underwater operations, evacuation, fire protection, medical and industrial dust protection, and respiratory protective equipment for infants and children.

Test: 85 L/min, 0.075 µm NaCl aerosol, 0.185 µm oil particles, requirements Class A 95%, Class BCD 90%. Another particle protection test is done to simulate normal breathing, particles 0.02-2 µm, Level A protection 90%.

(4) Summary

KN95 GB2626 is same as N95 that Americans talk about, that is, salt particles with a flow rate of 85 and a particle size of 0.075, which can filter out 95% and prevent salt, but not oil. Requires tightness. It should be said that it can prevent most air pollution, except for poisonous gas and fire. In addition to preventing smog, it is also suitable for long-term exposure to dusty environments such as factories.

GB19083 is also salt resistant but not oil resistant. It does not require air leakage, but adds blood protection that doctors and nurses use.

GB32610 is not only equivalent to salt resistance of KN95, but also to oil resistance of KP95. The protective effect is similar to 2626 leak prevention. However, 32610 has four ABCD levels, only A level can reach 95%, BCD level only 90%.

Therefore, it cannot be said that masks other than N95 should not be purchased, and masks that can meet above national standards also havethe best protective properties.

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