What Plastic Is Least Or Not Harmful?

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Author	Replies: 9 / Views: 705
micoin Valued Member United States 56 Posts	Posted 03/21/2025 03:29 am I want to store/show proof Jefferson nickels Report this Post to the Staff

Dearborn Moderator United States 70317 Posts	Posted 03/21/2025 09:55 am For safe coin storage, the safest plastics are those that are chemically inert and acid-free, such as archival polyester (often known as Mylar or Melinex) and polypropylene. Avoid PVC, as it can damage coins over time. have a look here: https://www.preservationequipment.c...%20'Melinex'. Collecting since 1972. Learning from then on "Tell me and I forget. Teach me and I remember. Involve me and I learn." - Benjamin Franklin 7070 type set coin count: 47/76 Uncirculated American Silver Eagles My American Silver Eagle Proof Collection Innovation Dollars Eisenhower-Dollars Kennedy-Half Dollars Washington-Quarters Roosevelt-Dimes Buffalo-Nickels Jefferson-Nickels Lincoln-Cents Report this Post to the Staff
micoin Valued Member United States 56 Posts	Posted 03/21/2025 10:30 am are vinyl and mylar O.K.? are they chemically inert and acid-free? Report this Post to the Staff
micoin Valued Member United States 56 Posts	Posted 03/21/2025 10:36 am sorry about that, asking about the mylar you had already answered but is vinyl O.K.? chemically inert and acid-free? Report this Post to the Staff
Zurie Pillar of the Community United States 5300 Posts	Posted 03/21/2025 11:54 am Many types of vinyl, like PVC (polyvinyl chloride), contain plasticizers to make them soft and pliable, which can harm coins. Report this Post to the Staff
micoin Valued Member United States 56 Posts	Posted 03/21/2025 2:09 pm how about acrylic? Report this Post to the Staff
micoin Valued Member United States 56 Posts	Posted 03/21/2025 10:14 pm I was thinking about the putting the proofs in archival polyester coin store pockets that are 50 x50 mm and sealing them some way and then putting the holders in Coin Flip Holder Albums - 120 Pockets 2x2 Coin Flips Coin Storage Books for Coin and I wonder if the PVC holder will react touching the archival polyester pockets and cause problems is that feasible? Report this Post to the Staff
BStrauss3 Pillar of the Community United States 4378 Posts	Posted 03/22/2025 09:14 am Acrylic plastic is safe, I've had a piece in my eye for 39 years. Ideally you want something rigid, close fitting (so there's no sliding around) and inert. -----Burton 50 year / Life / Emeritus ANA member (joined 12/1/1973) Life member: Numismatics International, CONECA Member: TNA, FtWCC, NETCC, OnLine Coin Club Owned by four cats and a wife of 40 years (joined 1983) Report this Post to the Staff
micoin Valued Member United States 56 Posts	Posted 03/22/2025 5:45 pm then my previous idea for the holder won't be good as the cases I was looking at are 100 mic thick with is 0.0001" thick and that's not rigid enough to hold the nickel securely maybe I should get a sheet of Acrylic plastic or one of the other suitable inert plastics .020 or .030 thick and build my own cases as I've got a pro heat sealing machine I got on ebay, so, back to my original question I wonder if the PVC holder will react touching the acrylic or other inert plastic I chose and cause the inertness to disappear over time? Report this Post to the Staff
micoin Valued Member United States 56 Posts	Posted 03/23/2025 10:23 pm I checked the sealer/welder out on a acetone slider from a Littleton book (its .010) put two together and welded them at 160 Centigrade with no problems, so I won't have any trouble welding 2x2 for the holders I just need to make some kind of jig to produce/assemble them but the thing that can unmake my triumph so far, * is * back to my original question I wonder if the PVC holder will react touching the acrylic or other inert plastic I chose and cause the inertness to disappear over time and I have to hold them some other way? Report this Post to the Staff
	Replies: 9 / Views: 705

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