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preserve electronic devices
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CatalinaWOW:

--- Quote from: coppice on November 10, 2020, 09:26:53 pm ---
--- Quote from: classicsamus87 on November 10, 2020, 08:25:13 pm ---please i need good ziplock bag not enter humidity

--- End quote ---
The kind of ziplock bag with a port on it, so you can suck out the air, stay deflated for a very long time. They must be pretty good at keeping out moisture.

--- End quote ---

Average partial pressure of water in the atmosphere is quite low at normal storage temperatures.  On the order of 0.04 atmosphere.  You won't notice that the bag has filled with water vapor at equilibrium to the environment.  But that is the end state when diffusion has taken over.  The kind of measure you are describing is leak rate.  I don't know what "very long time" means to you.  Someone who is trying to save something for collector value probably wants to store these things for 10 to 50 years.  I wouldn't bet on those bags having a low enough leak rate to support those durations.  The ones I am familiar with are used for clothes storage and food storage.  Both applications that don't need much more than a couple of years. 

amyk:
Use Mylar bags for much lower permeability.
classicsamus87:

Is this mylar zip bag the best and does it not let moisture in?

https://pt.aliexpress.com/item/32923355461.html?spm=a2g0o.productlist.0.0.40417d86I4Vedp&algo_pvid=d6aa9da5-c15e-4de9-8d0c-18be3f746935&algo_expid=d6aa9da5-c15e-4de9-8d0c-18be3f746935-0&btsid=0bb0623116050902765072438ee911&ws_ab_test=searchweb0_0,searchweb201602_,searchweb201603_
SilverSolder:

Everything lets moisture in if you wait long enough, unless you go to extremes like sealed metal or glass vessels.
coppice:

--- Quote from: CatalinaWOW on November 10, 2020, 11:54:53 pm ---
--- Quote from: coppice on November 10, 2020, 09:26:53 pm ---
--- Quote from: classicsamus87 on November 10, 2020, 08:25:13 pm ---please i need good ziplock bag not enter humidity

--- End quote ---
The kind of ziplock bag with a port on it, so you can suck out the air, stay deflated for a very long time. They must be pretty good at keeping out moisture.

--- End quote ---

Average partial pressure of water in the atmosphere is quite low at normal storage temperatures.  On the order of 0.04 atmosphere.  You won't notice that the bag has filled with water vapor at equilibrium to the environment.  But that is the end state when diffusion has taken over.  The kind of measure you are describing is leak rate.  I don't know what "very long time" means to you.  Someone who is trying to save something for collector value probably wants to store these things for 10 to 50 years.  I wouldn't bet on those bags having a low enough leak rate to support those durations.  The ones I am familiar with are used for clothes storage and food storage.  Both applications that don't need much more than a couple of years.

--- End quote ---
I'm judging by things like a wedding dress I have seen, which had been sealed in one of those bags for about 30 years, and so little air had seeped in that it was still rigid. Air gets in more easily than moisture. I think the biggest problem with these things is its hard to know if the seal has closed properly. You really need to check in the first few week if the bag shows any signs of expansion.
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