Q: What's the N95, KN95, FFP2? A: FFP1, FFP2 and FFP3 are European standards. KN90, KN95 are Chinese standards. N90 and N95 are American NOISH standards. The principle, test method and test instrument of the three are almost the same, so the particle filtering effect can be roughly considered as: FFP3 > FFP2 = KN95=N95 > FFP1 = KN90 = N90, that is, FFP1 mask meets N90 standards, FFP2 mask meets N95 standards.Q: How long can a protective mask last? A: For ordinary daily protection, it is recommended to replace disposable masks in about 1-3 days. When reused, please keep them properly and do not wash them (washing will damage the molecular structure of the non-woven fabric and damage the filtering performance). If the mask is damaged, stays in a crowded place for a long time, or is splashed by pollutants (such as being infected by saliva droplets of others), the protective mask should be replaced in time.
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