KN95 is a Chinese standard mask
Source: Chinese National standard GB 2626-2006 respiratory Protective Equipment Self-priming Filter Respirator against Particulate Matter
(1) Standard sources
This standard is a mandatory National standard of China, proposed by the State Administration of Work Safety and promulgated by the National Technical Committee for the Standardization of Personal Protective Equipment (SAC/TC 112).
(2) Technical content
In terms of the scope of application, this standard is applicable to ordinary respirators with self-suction and filtration protection for all kinds of particulate matters, such as masks, and not applicable to other special environments (such as anoxic environment, underwater work, etc.)
In terms of the definition of particulate matter, this standard defines various forms of particulate matter, including dust, smoke, fog and microorganisms, but does not define the size of particulate matter.
From the level of filter elements, it can be divided into KN class for filtering non-oily particles and KP class for filtering oily and non-oily particles, and this is marked, which is similar to N and R/P stipulated in CFR 42-84-1995 interpretation guidelines.