What is the difference between N95 and Kn95?

In terms of international standard, there is no difference between N95 and Kn95. KN95 is one of the level specified in the standard GB2626-2006 in China. N95 is one of the standard level of 42 CFR 84 in the United States. The major difference between them is the standard made by different countries.

N95 refers to NIOSH standard which belongs to the subsidiary institute for occupational safety and health of the United States centers for disease control and prevention (CDC). “KN” is a Chinese standard, generally refers to the “GB2626-2019” (or GB2626-2006) standards.

NIOSH standard is more suitable for medical and health and biological medicine field, while GB2626 standard focuses more on the industrial production and labor protection. In addition to filtration efficiency, adaptation, flow resistance, flame retardant and other indicators, the N95 respirator also passed the synthetic blood test and wet resistance test. However, there is no additional requirement of those points to “KN95” (GB2626 standard) mask, because there is no guarantee that the mask would not be wet in the rain. During operation, it’s hard to guarantee that patients’ blood, body fluids, secretions will not spilt, especially tracheotomy and endotracheal intubation operations.

To sum up, I would rather say the recommending rank of mask should be as follows: N95 mask > surgical mask > common surgical masks > ordinary cotton masks. If worn correctly, N95 filtering ability is superior to ordinary masks and surgical masks!

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