Interesting. Nothing on their website either.
I'd think the sleeves were the same stuff as their other sleeves, but I suppose it couldn't hurt to email them.
I've used just about everything that's come along since 1974 at one time or another. I haven't had many problems. The old vinyl pages had their troubles of course, No damage on any of my stuff but I'm finally out of them completely. And no issues with any sleeves I've used.
I did have some sleeves that were left in the sun for around 5 years get brittle and come apart when touched. No damage to the cards.
And actual Mylar sleeves are a nuisance in toploaders. The ones I had were melted together leaving a thick seam. Espaecially at the corners. So I had to cut the corners off to get them in the toploaders. After a few years they got stuck to the toploader. Not chemically since Mylar is mostly inert, but no air between two smooth surfaces means it's not coming out. After damaging a card removing it, I went with cutting the toploaders afterwards.
I'm not sure about the new ones, but the toploaders do get yellow with age especially if exposed to light.
Steve B
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10-12-2013, 10:13 PM
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