Messages

Subject:
polymer chemistry
Response To:
Way-OT- Masks ()

Bill Tindall, E.Tn.
Oxygen/ozone breaks down the elastomer used for the strap. They will crumble after some amount of time. The 3M expiration date gives an estimate of how long they will last under some "average" conditions. In a city with lots of ozone, less than other places.

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