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 Replies: 7 / Views: 2,668 |
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Valued Member
Canada
54 Posts |
I've been looking for the cheapest non-pvc coin flips (I just started coin collecting and ordered a couple starter lots).
I've found a couple that I asked the sellers about and one said the plastic was made out of "OPP" and another said theirs were made out of "PP". Are these safe for coins?
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Pillar of the Community
 United States
4591 Posts |
PP in the plastics industry is poly - propylene. It's commonly used in food packaging.
-----Burton 50+ year / Life / Emeritus ANA member (joined 12/1/1973) Life member: Numismatics International, CONECA Member: TNA, FtWCC, NETCC, EveryCountry (online) coin club Owned by three cats and a wife of 40+ years (joined 1983) Author: 3rd Edition of the Sample Slabs book, https://www.sampleslabs.info/ |
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Valued Member
 Canada
54 Posts |
So if it's safe for food packaging, it'll be fine for coins? I did a quick search on propylene (at work right now so cant spend too much time searching) and it seems like it's safe.
What would be better, OPP or PP? Quick search says OPP is stretched to make it stronger?
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Pillar of the Community
United States
4591 Posts |
I very much doubt that you will stress the capabilities of either in a coin flip.
BTW it is not the pvc itself that does the damage it is the plasticizer mixed in to make it flexible.
-----Burton 50+ year / Life / Emeritus ANA member (joined 12/1/1973) Life member: Numismatics International, CONECA Member: TNA, FtWCC, NETCC, EveryCountry (online) coin club Owned by three cats and a wife of 40+ years (joined 1983) Author: 3rd Edition of the Sample Slabs book, https://www.sampleslabs.info/ |
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Valued Member
United States
337 Posts |
One thing you need is air tight, since environmental damage can occur slowly, over years. Then, you need to verify if it will chemically interact with the coins, which might be different for 0.9999 silver than for copper or bronze. Your question needs to indicate the coin type, and how well the coin will be protected from the atmosphere. Then, consider the mechanical protection it affords.
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Bedrock of the Community
United States
20753 Posts |
I've never liked the plastic flips. I know they are nice since you can see the coin better but I still prefer the cardboard ones with the plastic inside. Allows a person to write STUFF on them about the coins.
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Pillar of the Community
United States
2543 Posts |
The PP flips are not as flexible and will break when folded too many times. The OPP ones are stretched to make them more flexible to bending. Personally I use Mylar flips they are inert, no damage to the coin, very flexible and they have a pocket for the coin and a separate pocket for an information card.
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Valued Member
Canada
54 Posts |
Ended up finding cardboard flips with mylar windows at a local store for cheaper... Weird, I was looking at wholesale prices from china (aliexpress.com), yet it's cheaper to buy here. (unless you're buying 10,000+ flips then it's cheaper from china wholesalers)
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Replies: 7 / Views: 2,668 |
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Posted 01/27/2014 12:20 pm
