Lifejackets?

I was given some old ones a while back, still in their packaging. Upon testing, not one of 8 inflated properly. 7 didn't inflate at all - the bladders had sort of welded themselves together. One of them the gas cylinder was empty, it must have leaked out slowly apparently from corrosion.
I find this odd.

Would you name the make (or pm it to me?)

I have life jackets that are 30 years old (I take them apart and use the fabric).

I have never found what you describe.

Poor make or poor storage? Or something else? In a solvent enriched area?
 
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