The baseball hall of fame has concerns:
Quote:
...the most startling piece of news for the hobby world was the museum’s disdain for what has become the Holy Grail of card collecting – the slab, a plastic encapsulation designed to protect valuable items (cards, autographs, ticket stubs, etc.) and prevent fraud.
Yes, the museum staff immediately breaks open every slabbed item donated to their collection (Editor’s note: Key word there is “donated,” not items on loan).
The problem with the slab? With several different products for slabbing in the marketplace, the museum has no way of knowing whether any particular petroleum-based plastic slab is likely to cause damage in the long-term to a vulnerable card or other paper item encased in the slab. The practice of slabbing began recently enough that there is not a long enough track record to be certain that damage will not result over time.
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http://www.sportscollectorsdigest.co...slabbed-cards/
To be fair they did go on to say that it also has to do with the amount of space the slabs take.
Here is a thread that was started when that article came out:
http://www.net54baseball.com/showthread.php?t=223468