Expiry Dates

[writerkit]

How rigid is the expiry date on a KN95? I'm realizing that it is possible the reason Bona Fide Masks was having a sale has to do with the age of the stock-- the ones I just ordered were manufactured in April 2022 with a listed shelf-life of three years. If I'm not opening the package, how firm is that?

Comments

[kathmandu]

SmartAirFilters* has a blog entry on N95 expiration dates, saying the straps and ability to stay on tend to expire before the filtration capability, as long as it was stored within design limits.

I would suspect KN95s are essentially the same material/technology, so similar expiration behavior.

*They've been a reliable source on filtration materials since the pandemic started.