Originally Posted by JPA Cate
What happens to it when it "expires"? Is it that you can't be sure it is sterile any more?
Exactly, but has to do with storage
conditions etc, the dates come from what the manufacturer is comfortable in guaranteeing worst case, sort of like EPIRB batteries
, not actual testing to see how long it will actually remain sterile.
Mine are from when I was flying in the NWT of Canada
and I’m sure out of date, but if needed they will be used.