The KN95 designation is a Chinese government standard that is widely considered to be equivalent to the N95 masks approved by American regulators. Guidance issued by the Centers for Disease Control (CDC) says the KN95 masks are "suitable alternatives" to the N95 mask

The medical mask is composed of mask body and tension belt. The mask body is divided into three layers: inner, middle and outer. The inner layer is skin friendly material (ordinary sanitary gauze or non-woven fabric), the middle layer is isolation filter layer (ultra-fine polypropylene fiber melt blown material layer), and the outer layer is special material bacteriostatic layer (non-woven fabric or ultra-thin polypropylene melt blown material layer).

Filtering facepiece respirators (FFR) are subject to various regulatory standards around the world (see examples below) and provide a much higher level of protection with face form fitting and greater pressure drop. To claim compliance with the particular standard as listed below, these respirators must meet or exceed required physical properties and performance characteristics, which can vary according to the regulatory bodies of different countries.
  • N95 (United States NIOSH-42CFR84)

  • FFP2 (Europe EN 149-2001)

  • KN95 (China GB2626-2006)

  • P2 (Australia/New Zealand AS/NZA 1716:2012)

  • Korea 1st class (Korea KMOEL - 2017-64)

  • DS (Japan JMHLW-Notification 214, 2018)

The Center for Disease Control (CDC) recommends the N95/KN95/FFP2 for use in high risk situations, especially by medical personnel during pandemics. They are not exactly the same, but they are expected to function very similarly to one another.A reference by 3M in a technical bulletin* released in January 2020 demonstrates that the several country-specific standards used to grade the FFR tend to converge into functional equivalence. N95 (US), KN95 (China) and FFP2 (EU) standards produce FFR devices that are similar enough to be interchangeable for the purposes of their use in a pandemic. All of them are good for filtering non-oil-based particles such as those resulting from wildfires, PM 2.5 air pollution, volcanic eruptions, or bioaerosols (e.g. viruses).