Discussion in 'Ancient Coins' started by Basileus Antialcidas, Jul 11, 2022.
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See: https://doi.org/10.1016/j.jaap.2013.01.006 for a model to predict the amount of gas that will be produced from PVC-based materials upon thermal treatment
This may have happened because the price of quality timber has increased exponentially over recent years and the manufacturer is looking for cheaper ways of construction.
I wish you well whatever you do.
I am not sure what the effects over time would be, if any, for PVC vapors on coins stored in the cabinet. Is there felt or some other soft material covering the drawer bottom? That material might serve as a buffer against any potential PVC vapors. Also room temperature might have a role in the creation of PVC vapors.
Yes, I think getting an opinion from an owner with a similar cabinet would be very helpful.
So to be exact when I asked about the PVC he attacked me and started rampaging about being top quality and that I am paranoid and insecure as the coins don't come in direct contact with the PVC. I talked with ebay and started the return. Here is a photo of the bottom. See how he used PVC to cover probably a part that is not made with real wood.
Also I am thinking now to order an other from an other seller. I found one that he doesn't use chemicals, solvents or plastic. His velvet is viscose and he uses for wood dry fir and toulipier. Would it be okay as it is not mahogany? I can't find someone who makes with mahogany.
Or try to locate a Swan Coin Cabinet - best ever made
I recommend searching CoinTalk, and Forum Ancient Coins, and Google, to find out, what effects, the various types of wood have, on ancient coins.
I read somewhere, that mahogany is best, because it causes the least amount of toning and patina, on coins. Search, and find out, if that's true.
Myself, I don't worry about toning and patina, because I like toning and patina.
For myself, I use Abafil velvet trays, and Abafil cases. I read, that Abafil velvet trays, won't harm ancient coins, except perhaps to cause the coins to tone and patina. Each tray has silk, or something like that, on the bottom of the tray. Also, the cases are lined with silk or something like that. I don't know, if the silk or whatever, has any effect on coins. I've only had the Abafil trays and cases, for 4 years, so I haven't had enough time, to find out, if they would harm coins.
Regarding the PVC in your new coin cabinet, I don't know enough, to know, if the PVC in the bottom of each tray, would harm your coins.
If you had to, perhaps you could remove the PVC sheets, and replace them, with sheets of acid free paper or velvet or silk or something that is known not to affect coins much, using wood glue or something to glue them on.
Now that I think about it some more, perhaps acid free paper would not be a good idea, because if a coin is thick, then the coin may rub against the paper, and get worn.
It seems silly, to use PVC sheets, in a coin cabinet, because "PVC" is a dirty word, among coin collectors.
This is correct. I'm not aware of any risk to coins being "near" PVC plastic. The harm comes from storing coins in PVC flips with direct contact. The PVC degrades and can leave a film or crud on the coins where touching. I can attest from experience, as I had an old collection from my teen years stored in PVC flips. 30 years later, a few of the coins had some green, PVC crud on them. Most were not affected at all.
But I share the opinion of others above that a "quality" coin cabinet should not contain plastic.
As someone said above the glues and elements used for bonding are probably worse on the coins than the solid PVC.
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