What Is Best Temperature And Humidity For Coin Storage

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Author	Replies: 10 / Views: 6,799
GR58 Bedrock of the Community United States 11951 Posts	Posted 04/09/2018 12:52 pm I have been monitoring the temperature and humidity of the room I am storing my coins in. Seems to be staying in mid 60's temp and low 30's humidity. I am hoping someone might know the idea ranges. Report this Post to the Staff

moxking Rest in Peace United States 17900 Posts	Posted 04/09/2018 1:11 pm Humidity is more important than an average temperature. As close to 0 as is possible is of primary concern. Report this Post to the Staff
T-BOP Rest in Peace United States 18456 Posts	Posted 04/09/2018 1:37 pm I have to agree ,but temp. shouldn't be too high or too low either . I'm thinking about 65 degrees Fahrenheit should be good . Report this Post to the Staff
jbuck Moderator United States 188213 Posts	Posted 04/09/2018 4:34 pm It is not the temperature or humidity alone, but the potential for condensation. The chance of condensation increases with higher humidity. It also increases with higher temperature swings, think hot humid days followed by cool nights. This is why I always recommend low humidity and stable temperatures. Here is a great site I have bookmarked. Take a look at how different temperature and humidity values affect different things (particularly "Metal Corrosion")... http://www.dpcalc.org/ Coin Collector Since 1978 Avatar Old Avatar 7070 Eisenhower Australia Canada World CCF Members on eBay CCF eBay Search Engine Report this Post to the Staff
BadThad Bedrock of the Community United States 19948 Posts	Posted 04/09/2018 5:03 pm Agree with jbuck, it's the wide swings that have the most adverse effect on coins. Low humidity and constant temperature are the keys. Lincoln Cent Lover! VERDI-CARE™ INVENTOR https://verdi.care/ Report this Post to the Staff
GR58 Bedrock of the Community United States 11951 Posts	Posted 04/09/2018 5:20 pm Thanks for the replies... I have tried to read several sites, and not getting any consistent answer. I agree that big swings in temp would be bad. I don't live in a desert ... thinking zero percent humidity would not be reallistic. Also I am thinking to dry might not be good on the albums. Also, old school, to dry is not good on electronics, that are also in the room. I have been watching all winter and the temp/RH are very stable. I will be watching what it does this summer. I might move my temp/RH gauge the the bank box for a little while, to see what condition my coins are there. Report this Post to the Staff
jbuck Moderator United States 188213 Posts	Posted 04/09/2018 5:45 pm Quote: Also I am thinking to dry might not be good on the albums. Correct. If you look at the link I posted, extremely dry (or extremely moist) air increases chance of mechanical damage... Quote: Hygroscopic (water-absorbing) materials change size and shape depending on the amount of water they contain. These physical reactions are based on the amount of moisture in the air (RH). Maximum %EMC indicates a damp environment while Minimum %EMC identifies a dry environment. These conditions, as well as wide and/or frequent fluctuations can result in mechanical damage. Coin Collector Since 1978 Avatar Old Avatar 7070 Eisenhower Australia Canada World CCF Members on eBay CCF eBay Search Engine Report this Post to the Staff
GR58 Bedrock of the Community United States 11951 Posts	Posted 04/09/2018 7:35 pm Nice link . Thanks Jbuck ... Report this Post to the Staff
just carl Bedrock of the Community United States 20753 Posts	Posted 04/10/2018 08:40 am I too agree that excessive changes in temperatures will cause more of a problem than just dehudification alone. I use a dehumidifier in my house to keep the entire house at well below 25% and as constant as possible. Also, you should remember that temperature and humidity alone are not necessarily the worst thing for coins. If you live in an area where Sulfur rich coal is used, such as a fossil power plant, the air itself is possibly full of SO2. In the Mid West organizations that use Copper for Grounding have found it slowly vanishes due to the SO2 in the air which mixed with moisture becomes an Acid. This attacks the Ground cables. Same effect on many coins. One more reason to keep coins in a safe place away from the outside elements. Report this Post to the Staff
jbuck Moderator United States 188213 Posts	Posted 04/10/2018 10:25 am Quote: Thanks Jbuck ... You are welcome. Quote: If you live in an area where Sulfur rich coal is used, such as a fossil power plant, the air itself is possibly full of SO2. I love my nuclear power plant. Coin Collector Since 1978 Avatar Old Avatar 7070 Eisenhower Australia Canada World CCF Members on eBay CCF eBay Search Engine Report this Post to the Staff
chequer Pillar of the Community Canada 4227 Posts	Posted 04/10/2018 10:41 am Quote: Quote: If you live in an area where Sulfur rich coal is used, such as a fossil power plant, the air itself is possibly full of SO2. Our home is across the river from a pulp mill. Report this Post to the Staff
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