I've had to make a common sense response regarding respirator filter expiration to a surplus seller leaving angry comments on my channel regarding supposedly "misinforming" people about how respirator filters work.
Rather than give him the satisfaction of a direct response I thought I'd make a video where I can present my arguments properly regarding the expiration of filters.
My stance has always been, a properly sealed filter will always last longer than it's factory use by/expiration date but there is no guarantee over how long it will last, would you really want to trust your life on something that has no guarantee of working?
For that same reason a filter that is still sealed and within it's expiration date can also be damaged and not work, I highlight some examples of this in the video.
If companies do not state an actual expiration date of their filters, they will often say they will last indefinitely if properly sealed, indefinite is not the same thing as infinite, indefinitely means it will last for an unknown amount of time.

Information on filter expiration.
https://www.cdc.gov/niosh/docs/2003144/
http://multimedia.3m.com/mws/media/44...
http://www.moldex.com/nonproduct/res...

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