Sd card holder?

[RoryduPondius]

Would it be safe to use a clear sd card holder to keep your coins in?

[Andrew McCabe]

Would it be safe to use a clear sd card holder to keep your coins in?

It might not be. Recall the scares over non-safe plastic coin-flips many years ago. Those plastics contained chemicals that degraded, especially in warm or humid environments. When they degraded they gave off vapour which, when combined with the water vapour in air, turned to acid and completely destroyed coins. Hence the switch to safe plastics such as mylar, which are much more brittle than older plastics but don't give off acidic gas. Unsafe flips could turn a coin from ok to a heap of dust in weeks.

Any other plastic holder, that is not specifically intended for coins, including those mainly of hard plastic,  might contain some unsafe plastics: the lining, the external cover, the backing etc. I had a look at pictures of some SD card holders. Some seem to include mixed materials, sometimes including some softer plastics, which generally post a higher risk. You just have no idea whether any custom folder, intended for a different purpose, is safe for coins or not, without knowing the chemical make-up of its plastics. So best probably to stick to solutions marketed by coin accessory firms.

[RoryduPondius]

i will put a slug in it and post the results... thanks!

[RoryduPondius]

ps mine has the recycle symbol with a 5 in the middle

Would it be safe to use a clear sd card holder to keep your coins in?

It might not be. Recall the scares over non-safe plastic coin-flips many years ago. Those plastics contained chemicals that degraded, especially in warm or humid environments. When they degraded they gave off vapour which, when combined with the water vapour in air, turned to acid and completely destroyed coins. Hence the switch to safe plastics such as mylar, which are much more brittle than older plastics but don't give off acidic gas. Unsafe flips could turn a coin from ok to a heap of dust in weeks.

Any other plastic holder, that is not specifically intended for coins, including those mainly of hard plastic,  might contain some unsafe plastics: the lining, the external cover, the backing etc. I had a look at pictures of some SD card holders. Some seem to include mixed materials, sometimes including some softer plastics, which generally post a higher risk. You just have no idea whether any custom folder, intended for a different purpose, is safe for coins or not, without knowing the chemical make-up of its plastics. So best probably to stick to solutions marketed by coin accessory firms.

[Andrew McCabe]

ps mine has the recycle symbol with a 5 in the middle

That means it contains mostly polypropylene and is designed for holding hot liquids. Although instinct suggests that anything suitable for hot liquids must be very inert and not prone to degradation or vapours coming off, it still does not guarantee it is safe for coins - your mostly-polypropylene sd card holder might include coatings, covers, padding or inserts in different materials. It might or might not be ok. You could do a visual check to see if it is only made of a single type of hard plastic (generally when it comes to plastics, soft is "bad" where coins are concerned as it indicates the presence of volatile softening materials sometimes called plasticisers). Or you could buy some archival quality coin holders:

Supplies

https://www.forumancientcoins.com/catalog/roman-and-greek-coins.asp?vpar=861&pos=0#Coin Collecting Supplies