We can see that many masks are marked with different letters, such as KN95, etc. So what do they mean?

According to the standard, the N marked on the mask represents the American standard, FFP is the European standard, and KN is the Chinese standard.

FFP European standard masks are certified by the European Standards Committee Respiratory Protective Equipment. The standard is to divide the granular protection filter into solid particle protection and liquid particle protection. They are tested and classified by NaCL (sodium chloride) and DOP (paraffin oil) aerosols. The role is to absorb harmful aerosols, including dust, smoke, mist, toxic gas and toxic vapor, etc., through the filter material, blocking it from being inhaled by people. Qualified solid particle protection filter material is divided into P1 (FFP1), P2 (FFP2), P3 (FFP3) three grades according to the tested particle penetration rate. , FFP3 minimum filtering effect ≥97%.

What are the FFP, N, and KN marked on the mask?

The American standard masks are graded by the National Institute of Occupational Safety and Health (NIOSH) on the filter material and filtering efficiency of the masks. This standard is the most recognized in the world. According to the filter material of the middle layer of the mask, there are three types:

N is Not resistant to oil, which can protect non-oily suspended particles. For example, the cooking fumes are oily particulates, and the droplets produced by people talking or coughing are not oily. Generally, non-oily particulate matter refers to coal dust, cement dust, acid mist, microorganisms, etc. In the raging smog pollution, the suspended particles are mostly non-oily. The oily particulate matter refers to oil fume, oil mist, asphalt smoke, etc.

R is Resistant to oil, which can protect non-oily and oily suspended particles, but when used for oily particles, the use time should not exceed 8 hours.

 P is oil Proof, which can protect non-oily and oily suspended particles. Compared with R series, P series is used for a relatively long time, according to the label of different manufacturers.

What are the FFP, N, and KN marked on the mask?

KN is a Chinese standard, and its detection method is the same as that of the United States. According to China's GB2626-2006 standard, masks are divided into KN and KP categories. KN means that the mask is suitable for filtering non-oily particles, and KP means that the mask is suitable for filtering oily. And non-oily particulate matter. The number after the letter represents the protection level of the mask. The larger the number, the higher the protection level.

 

What are the FFP, N, and KN marked on the mask?

How should the protection level be converted between three different standard masks? Obviously, the EU FFP can filter non-oily and oily particles at the same time, while the US and China N and KN can only effectively filter non-oily particles. Therefore, their protective effect formula is roughly: FFP3> FFP2 = N95 = KN95> KN90

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