I have a bit of anecdotal experience to add to this thread.
I recently received a binder of 1959 Topps cards from my father, which he had been keeping in storage for roughly 35 years. The set was stored in 9 page sleeves from some brand I'd never heard of. Probably one of the first brands to start making plastic pages. Whatever plastic they used had yellowed and degraded to the point you could barely see the cards, but when I pulled them out I was delighted to find them in pack fresh condition with crisp colors and bright white borders. I had many graded PSA 8 & 9.
So thirty years in yellowing mystery plastic didn't seem to harm them at all. Hardly conclusive, but I wouldn't worry too much about the type of plastic you're using for storage...
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Last edited by poorlydrawncat; 06-07-2016 at 09:19 PM.
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