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#1
04-01-2012, 07:33 AM
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Sounds like the former is polyethylene and the latter polypropylene.
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#2
04-01-2012, 02:19 PM
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There are two different varieties of Ultra-Pro penny sleeves that I know of:
The first and better of the two are the "Platinum series Premium Card Sleeves" - black background cover, says Heaviest Gauge Poly and Crystal Clear. The second are the "Sleeve series Card Sleeves" - black & blue background cover, says Clear Polypropylene and Ultra Clear. I can't feel any difference in "slipperyness" but the second variety are definitely foggier than the "Platinum" variety. As for vintage (1952-1956) Ultra-Pro sleeves, they only seem to make one kind that's unfortunately of the foggier variety. Cover says Clear Polypropylene, which would support what Exhibitman says.
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