Our N95 and K95 Masks are not washable. Please kindly visit this link to review the CDC guidelines on the extended use of N95 / KN95 Masks.
KN95 / N95 masks are constructed to fit to the contours of the wearer’s face, especially if the mask is attached to the back of the neck and crown, and filter 95% of aerosols. Infection takes as long as 25 hours.
How effective are N95/KN95 Masks in comparison to other masks, such as surgical and cloth masks?
N95/KN95 masks are guaranteed to filter out 95% of three (3) micron particles. With this in mind, the majority of particles/fine aerosols we inhale (including the aerosols that transmit COVID-19) are smaller than three (3) microns in size. In addition to this, they fit the contours of the wearer's face more efficiently, while providing a tight facial seal, especially if you are donning a cup-style respirator that features head straps as opposed to ear loops.
In order for an N95/KN95 mask to meet all requirements, 15-20 tests must be performed. To put this into perspective, surgical masks only require four (4) tests to be conducted, and these do not include the fit of the mask.
"N95 masks are more durable than surgical masks, which lose their efficacy after around four hours of use. A disposable mask has a useful life span of around eight hours, while reusable models can last for 30 hours. Between uses, it is important to ensure that the mask is allowed to dry out, while also checking that it is in good condition, has not been damaged in any way and that its fastenings retain their elasticity. Tests carried out with high levels of the virus showed that it can remain active for up to 72 hours in an N95. Four N95 masks alternated every 72 hours could last up to 20 days." Source
The best facial seal and filtration efficiency are offered by an KN95/N95 that is well-fitted and secured to the wearer's face. When donning an N95/KN95 mask, infection between two individuals can take as long as 25 hours.