"damp Rid" Moisture Absorber

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Author	Replies: 4 / Views: 4,683
jcook54 Pillar of the Community United States 533 Posts	Posted 11/02/2009 1:26 pm I use "Damp Rid" moisture absorber in my closets and was wondering if anyone has had any experience using it. You can get it at Home Depot and the MSDS says it's basically Calcium Chloride. I have a container of it that sits on a shelf and doesn't come into contact with anything but my safe is bolted to the floor in one of the closets. Does anyone see a problem with this? I think when the moisture precipitates out it is basically a corrosive salt compound. Do you think that it could cause a problem just sharing a closed space with my safe? I'm curious at this point because I also do marine aquariums and over time salt from the evaporation can build up on items outside the tank that never get wet. Any thoughts are appreciated. Report this Post to the Staff

biokemist6 Bedrock of the Community United States 12437 Posts	Posted 11/02/2009 3:09 pm The moisture doesn't precipitate out as anything, it is absorbed by the Damp Rid. It will eventually convert to a brine solution if it absorbs enough water but that would only happen if you completely ignored it for a very long time. Once it becomes a little moist, you should be able to dry it out in an oven for reuse. Calcium chloride is very hygroscopic meaning that it has a strong attraction(affinity) for water. It basically acts like a sponge by pulling water vapor out of the air. Calcium chloride is also a substitute for rock salt in removing snow and ice from outdoor surfaces in winter. Report this Post to the Staff
jcook54 Pillar of the Community United States 533 Posts	Posted 11/02/2009 3:24 pm Converting to said brine solution is how this particular product works. It starts as white chunks in a perforated basket and as they attract moisture they turn to mush and the liquid itself drips into the bottom of the container. The brine solution is then dumped out per the instructions. I keep desiccant inside the safe itself and oven-dry when "full" of moisture. I'm just not sure this Damp-Rid stuff is something I want in the same enclosed space as my safe. If it weren't for the safe I wouldn't be at all concerned. Report this Post to the Staff
biokemist6 Bedrock of the Community United States 12437 Posts	Posted 11/02/2009 4:24 pm Damp Rid might be overkill for the amount of moisture encountered in a safe. It seems like it is a product for large open areas, not a small enclosed area like a safe. You would probably be better off sticking with a silica gel-based desiccant for a safe. Report this Post to the Staff
just carl Bedrock of the Community United States 20753 Posts	Posted 11/02/2009 5:25 pm So much depends too on how often you open your safe. And the average humdity in your area and in your home. You may want to invest in a Hygrometer to measure Humidity in your safe and in your home. Also, is your safe in a basement? If so remember that humidity is mositure and it is heavy and most basements are excessively high in humidity and especially in some areas of the country. Contrary would be if you live in excessively dry area such as Arizona. In such places humidity is of little concern but still if a basement is not well ventilated, humidity builds up. Many people tend to keep their safes open all the time unttil they plan on leaving for a while. If you tend to do that, then almost any moisture riding method is a waste. Report this Post to the Staff
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