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Replies: 15 / Views: 2,279 |
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Valued Member
United States
245 Posts |
I guess this goes in supplies. I read that the clear PVC tube was safe for silver, but thought I would put it out here. I can get some of this at a fairly decent price, and was considering it for sorting/temporary storing bin. (Creating a box with a 6" tube (would fit 100+ coins) for each year so I can do quick sorts before I go back and do more thorough cataloging. This is in reference to Mercury dimes. .705" diameter Thanks!
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Moderator
 United States
189340 Posts |
Rigid PVC should be safe for coins. It is soft PVC that is bad. The plasticizers used to soften the PVC is what causes problems for coins.
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Pillar of the Community
Canada
1747 Posts |
Just a question, what about prescription containers? I am sure that these are all food grade, and contain no BPA, not sure about PVC?
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Moderator
 United States
189340 Posts |
I think those are polyethylene. Totally safe for coins. Assuming there is no drug residue.
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Pillar of the Community
Canada
1747 Posts |
So they are actually PP (#5) Polypropylene. Is there issues with this?
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Pillar of the Community
Canada
2519 Posts |
PP is food grade plastic I believe. I own notes and coins that had been stored in food grade plastic (in a drawer, away from direct sunlight or whatever could degrade it) for about ten years before I had a look at them and they appear fine.
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Pillar of the Community
 United States
4593 Posts |
As jbuck said, it's the plasticizers that make the PVC softer (less rigid) that are the problem. I have junk silver in a rigid plastic box (probably PVC) that we filled when clad coinage was introduced - the coins look today just like they did back then.
-----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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Bedrock of the Community
Australia
21788 Posts |
I stand to be corrected, but I thought coin tubes were made out of acryllic plastic - the same material used for hard clear plastic faucet handles.
Hard uPVC (unplasticised PolyVinyl Chloride), is used for small bore water drainage. It is almost always colored opaque white, TiO2 pigment being responsible for the white color. Polypropylene and ABS plastics are also used for piping, ABS used for car bumper bars and wheel covers.
I dunno what is the hard clear plastic used for slabs and screw capsules, but I suspect acryllic.
Polyethylene is used for plastic food storage bags, and polypropylene and Mylar occasionally used for better quality album pages.
PVA (PolyVinyl Acetate) is used for shirt boxes and packaging for small toys batteries and such like. This material is perfectly safe for coins, although I have seen it discolour to orange, with absolutely no injury to the coins it may contain. Coins flips are sometimes made from this stuff.
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Moderator
 United States
189340 Posts |
Quote: So they are actually PP (#5) Polypropylene. Is there issues with this? Yeah, I meant to follow-up with a correction after I checked mine at home.  As stated above, there are no problems using them for coins.
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Pillar of the Community
United States
711 Posts |
Good knowledge all around there Sel. I assume you too work in the industry? For those wondering what that mystery plastic is and don't have access to a lab setting, check out this PDF link. With this PDF, a source of heat / flame, and a cup of water, you have all the tools needed to identify most plastics you will encounter in life. http://www.consultekusa.com/pdf/Tec...chart%20.pdfFor a coin collector, generally PVC is all we are worried about. It will never float in water. If it sinks, then light it on fire, if it stinks awful like hydrochloric acid, leaves a brittle char, has white smoke and a green tint to the flame, it is then PVC.
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Pillar of the Community
United States
711 Posts |
PVC isn't coin poison or anything either. From the OP it sounds like the coins would be in fairly rigid PVC tubes for a limited duration of time.
Absolutely zero risk there with regard to PVC outside of typical handling of the coins going into and out of the PVC tubes.
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Bedrock of the Community
Australia
21788 Posts |
I used to make cloth reinforced PVC industrial gloves with my father from the tender age of 12 years old! The PVC formed a chemical resistant, waterproof and abrasion resistant outer coating. The gloves were sold for use by chemical industry workers and also to the oil drilling / exploration industry in the Bass Strait oil fields. Vinyl Chloride came in white powder form, chrome yellow pigment was mixed with it, and a clear gooey plasticer was then mixed in to form a gooey mixture, into which the cloth glove inner liner was dipped. The freshly dipped and drained gloves were then baked at around 350 deg. C for about 20 minutes to polymerise the Vinyl Chloride monomer. The plasticizer was needed to keep the gloves supple.
My father designed and built the single unit plant to dip and bake the gloves. The plant was rather large and needed it's own house sized building. Occasionally I operated the whole plant by myself. The only thing my dad never let me do was mix the VC monomer and the plasticizer together.
I always had a very substantial income for a kid, and I invested all of my discretionary income in coins from late childhood onwards. Not many kids get to collect gold coins! I completed an Australian gold type set of 17 coins in 1966, with the purchase of an Adelaide Pound for my 20th birthday.
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Pillar of the Community
United States
711 Posts |
Small world.
I currently make vinyl laminated fabric reinforced with a polyester scrim. Some other parts too.
Generally I am more in suspension PVC (dry powdery mixes). Just in the last 2 years added what you are describing (plastisol) to my skill set. We use it to make windscreen. Think of a tennis court and the green tinted fabric on the chain link fence that minimizes the wind outdoors.
As for Australia, I very likely wrote the formula, bought the raw materials, and occasionally made the PVC computer desk chairmat in your country. I believe I had well over 75% of your nation's volume for roughly 10 years. If you bought it from Acco, you bought that from me. I was shipping full containers of them to Australia every month when I ran that business.
Small claim to plastic fame, my great aunt was in the movie The Graduate with the famous career advice of 'plastics'.
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Pillar of the Community
United States
1195 Posts |
Are these plastic containers the best way to store BU rolls of coins for a long period of time? (something like this maybe? http://www.valleycoin.com/product_i...s_id=8875)?) I want to invest in some BU coins and have no plans to sell them anytime soon. In my experience they have come in customer rolled paper wraps, I'm assuming that's not good for long term storage. I have air-tites but they are too expensive if you have a lot of coins. Alternatively I have quite a few of the cardboard holders from Cowens but that seems to be a lot of work since I'm talking full rolls here (but I'm willing to use them if thats the best way to store them). Thanks!
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Bedrock of the Community
Australia
21788 Posts |
BU rolls could be stored in screw cap tubes. I do not know if the roll paper is chlorine or acid free.
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Rest in Peace
United States
18456 Posts |
Pvc free plastic tubes is the best and inexpensive way to store bu rolls of coins.
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Replies: 15 / Views: 2,279 |
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