Title: More on Reusable N95 mask from China

Reportedly, the new product meets the KN95 standard, which is similar to certifications for the American N95 and European FFP2. The outside is a layer of cotton – superior to the non-woven material of disposable medical masks in terms of breathability, softness and comfort, says Shanghai Observer. Inside there is a thin nanofibre membrane that can filter 95% of particles as small as 0.075 micrometres in diameter (for reference, the latest coronavirus is about 0.1 micrometres in diameter, roughly one-900th the width of a human hair). Conventional disposable medical masks or N95 masks are made of melt-blown non-woven fabric as their main material, and the two layers of non-woven fabric are welded together by an ultrasonic process. The manufacturers of the new KN95 masks claim that a different method of production means that their masks can be used up to 20 times after being cleaned with boiled water, alcohol or diluted bleach, although the manufacturers advise that wearers stick to 10 usages for maximum effectiveness.

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  • World Health Organization (WHO)

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