General > General Technical Chat
moisture and electronics
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Halcyon:
Waterproof is one thing. Water vapour/moisture proof is entirely different.
micksmelanie:

I want to protect electronics from moisture that causes corrosion, and I want an opinion on this ziplock from aliexpress link above
helius:

--- Quote from: David Hess on June 28, 2020, 09:51:54 pm ---Common polyethylene bags are pretty permeable.  Try metalized Mylar or polyester bags which are gas tight which is why they are used for foods which would be affected by oxygen and water vapor.
--- End quote ---

The polyester bags are normally sold as "freezer bags" in the grocery store. They will do an adequate job blocking moisture ingress if fully sealed.
I am a little skeptical about the idea that silica gel is useless after 3 days in air. If you want to fully absorb all moisture leaving the contents of the bag totally dry, that's one thing. But the usual concern is not moisture, it's condensation. During daily temperature cycles, the dew point changes leading to a cycle of H2O in liquid and vapor phases (like in a terrarium). Silica gel can absorb enough moisture to stabilize the humidity and prevent outright condensation.
micksmelanie:
I will repeat as I am storing my electronics, it is inside an anti-static zip bag with some holes the bag is open to the moisture not stuck and the bag is inside a closed shoe box inside the box I also put 3 sachets of 2g of silica gel how many days will these 3 silica gel sachets protect everything inside the box?

When you don’t have silica, zip bags etc. do you have a day to protect against moisture and prevent condensation?

this is PE Zip lock bag from aliexpress link good or bad? two months for him to come to my house
Halcyon:

--- Quote from: micksmelanie on June 28, 2020, 10:48:54 pm ---I will repeat as I am storing my electronics, it is inside an anti-static zip bag with some holes the bag is open to the moisture not stuck and the bag is inside a closed shoe box inside the box I also put 3 sachets of 2g of silica gel how many days will these 3 silica gel sachets protect everything inside the box?

--- End quote ---

There is no easy answer. It depends how fast the silca gel absorbs moisture and how much moisture is in the air.

I don't live in a particularly humid environment but I found even the 40g units I have are saturated within a few days (initially at least). I used to use these "reusable" silica gel packs in aluminium cans for storing camera lenses in Pelican cases. Once saturated, you can "reactivate" them by baking them in a 150 degree C oven for a few hours.
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