Is My "Numis Strategy" Safe, Or A Mistake?

Thanks for responding, SuperDave ...

Yes, it's merely a brand of coin collecting plastic sleeves ... I guess I'm "assuming" that a company that makes coin collecting supplies knows enough to make them out of quality materials, but I was hoping for a wee bit of reassurance (but the fact that you haven't even heard of the supply maker's name, leaves me feeling a little bit rattled) ...

Maybe the real question should have been => "Is it okay to leave my coins in plastic sleeves for their remaining lives?"

Try googling this => numiscoinalbumsandbinders.shtml

... sorry, but again the real question should have been:

"Is it okay to store my coins in plastic sleeves for long periods of time?" (ie. my lifetime)

Okay, thanks ...

... curious, what does PVC do to coins?

Polyvinyl Chloride along with other plasticizers are additives to plastics which make them softer and more pliable. Think of the smell of a brand-new shower curtain - that's PVC. They degrade over time, releasing hydrochloric acid among other nasty things.

Not real good for coins to be bathed in hydrochloric acid, y'know?

Furthermore, once started, the reaction is taking place on the coin's surface and removing it from the offending container will not stop the process. Acetone will, absolutely, which is why you hear it discussed as a conservation agent here on the forum. What acetone won't do is reverse damage already done to the coin.

So you want coin flips, even the cardboard ones with the cutout windows, to use mylar or other PVC-free plastics. Let no PVC come anywhere near a coin.

None of this is a *permanent* solution. Keep in mind, allowing any oxygen at all to come into contact with a coin raises the possibility of some sort of eventual oxidation, especially in combination with the chemicals found in the (more or less) polluted air we breathe every day. The only truly safe way to store coins is in a zero-humidity vaccuum - everything else is a risk in one proportion or another.

Archival-quality flips, hard plastic cases, and the best-possible control over humidity can mitigate the risk to an extent which should satisfy all but the most obsessive collectors.

Numismaster albums are almost identical to Gardmaster albums for Canadian coins
I have some and have had no problem,but still won't put my best sets in them
The slides are mylar,the pages vinyl"with softening agents removed",no statement that the pages are"PVC free"

PVC is NOT a plasticizer. PVC is a hard, brittle often opaque plastic that requires the addition of plasticizer to make it pliable. PVC by itself is fairly benign. The plasticizer by itself is harmless. The problem comes from the two togehter. As PVC ages it degrades and gives off Hydrogen Chloride gas. The plasticizer will absorb this. It also absorbs water vapor from the air. The water vapor and the gas combine to create Hydrochloric acid which the plasticizer then holds in contact with the surface of the coin where it usually attacks the copper in the alloy creating Copper chloride which is green in color. This is why the "PVC residue" is sometimes referred to as "green slime".