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 Replies: 11 / Views: 6,506 |
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Valued Member
United States
62 Posts |
Kointainer Saflip made with PET is what I have decided to use -- but they only make a 2x2 and 2.5x2.5 flip. I'd like a 1.5x1.5 for pennies (so I can put 30 as a 5x6 row sheet instead of the traditional 20 as a 4x5 row sheet).
I think Saf-T-Flips are made of prolar polyester -- now is that the same protection as Kointainer Saflip. Is it truly zero PVC and long-term safe or is Kointainer the only true Mylar flip.
Come on Kointainer... let's make some 1.5x1.5 for everyone :)
Thank you!
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Pillar of the Community
United States
1882 Posts |
No, the Safe-T flip is not as safe for long term storage as the Saflip. The Safe-T does contain low levels of PVC. https://goccf.com/t/64035 |
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Pillar of the Community
United States
2120 Posts |
Honestly, I dont think and flip or 2x2 is good for long term storage. I think that if something is worth enough to you that you want to preserve it long term, buy an airtite. they might be $.45 each, but its worth it to protect that investment, IMO.
For lower grade coins why not just use cardboard 2x2's?
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Pillar of the Community
United States
1882 Posts |
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Honestly, I dont think and flip or 2x2 is good for long term storage. Sometimes I'll put a coin in a flip for the short-term...but it ends up being longer than short-term. :) |
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Valued Member
 United States
62 Posts |
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Honestly, I don't think and flip or 2x2 is good for long term storage. I think that if something is worth enough to you that you want to preserve it long term, buy an airtite. I was thinking if I heat-seal the Mylar flip it will be just as good as an air-tite and have the added benefit of having the second compartment to add an insert with nice computer-printed info -- then those all go in a 4x5 rows page to make a nice presentation. I don't like the idea of using a paper 2x2 even for low grade coins -- I don't trust the paper dust :) |
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Bedrock of the Community
United States
20753 Posts |
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Honestly, I dont think and flip or 2x2 is good for long term storage. Hopefully your wrong. I've had some coins in them for well over 20, 30 or more years. Possibly as long as they have been made. Not sure how long but a long, long time. No problems yet. |
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Pillar of the Community
United States
2120 Posts |
Well they are fine if you control environment variables. but 99% of people will just add a desiccant and call it good.
And I would be careful with heat sealing. Mylar is safe because its inert, but when you rapidly heat it some of it melts, causing a gaseous release, and that gas may or may not be harmful if trapped in side the pocket with the coin.
I dont know for sure the implications of heating mylar, just speculation.
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Pillar of the Community
United States
2120 Posts |
man three direct quotes in a row. I think thats a new personal record. :P
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Valued Member
United States
62 Posts |
Quote:
And I would be careful with heat sealing. Mylar is safe because its inert, but when you rapidly heat it some of it melts, causing a gaseous release, and that gas may or may not be harmful if trapped in side the pocket with the coin. Interesting take on this: Polyester can be heat sealed - the majority of flips are made that way although it can be sealed/welded ultrasonically. Any "offgassing" from the welding/sealing process would happen at the time of manufacture, long before you put your coin in it. It is also important to remember that all plastics are permeable (i.e., they "breath") so if something were trapped inside (have never heard of it) it would escape.-Quoted from Susan Maltby, Conservator, Maltby & Associates Inc., and Adjunct Faculty, Museum Studies Programme/FIS at the University of Toronto. http://www.cointalk.com/t51602/I am not sure if that is correct, I just mention it here for others to comment :) Edited by mbird
08/05/2010 3:54 pm
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New Member
United States
10 Posts |
I have some coins I put in a cardboard 2x2 back in 1977 and no problems. I was thinking about the self sealing cardboard flips but did wonder about the glue. Here is a link for 1.5 by 1.5 museum quality flips but you have to buy 1000 http://www.coinsupplyexpress.com/SF...ku-5000.aspx |
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Moderator
 United States
23522 Posts |
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It is also important to remember that all plastics are permeable (i.e., they "breath") so if something were trapped inside (have never heard of it) it would escape. Of course, that also means something from outside could get in. I'll defer to just carl's opinion here, since his view is based on personal observation over decades. |
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Bedrock of the Community
Australia
21786 Posts |
Airtites don't work well with ancient coins. For ancients, Mylar / cardboard 2x2's are better, because full attribution can be written of the cardboard.
Museums don't bother with flips at all. The coins are left to rest in recessed trays, with the attribution cards underneath. In these conditions, the coins can suffer from cabinet friction. For this reason, I think a 2x2 in an archival quality album page is a better solution to long term storage.
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Replies: 11 / Views: 6,506 |
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Posted 08/05/2010 11:22 am
