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moisture and electronics

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micksmelanie:
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

David Hess:

--- Quote from: helius on June 28, 2020, 10:39:57 pm ---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.
--- End quote ---

The freezer bags I have seen were all just thicker polyethylene.

Do a search for "Mylar metalized zip lock" and you will find lots of suitable bags.

micksmelanie:
Mylar metalized zip lock are very expensive I would like to purchase many units but it is unviable I would have to cancel the purchase of the PE Zip lock bag 0.12mm from Aliexpress

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

jogri:

--- Quote from: helius on June 28, 2020, 10:39:57 pm ---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.

--- End quote ---


I use desiccants for my work all the time (i need ppm levels of moisture for some stuff) and even good quality silica gel with an indicator gets discolored after a few days in open air, so crappy chinese stuff will probably last a bit longer (as it is just not that good ad adsorbing moisture) but i won't give it more than a week (and you need a lot of it, i usually use ~20g per litre of air). There are much better desiccants than silica gel available (namely phosporous pentoxide), but they are more difficult to handle (the pentoxide gets converted to liquid, highly concentrated acid) and silica is absolutely fine for most jobs.

@micksmelanie: You don't need an absolutely airtight container for your parts, so good quality ziplocks (or jam jars) are fine. If you however want to have a container that is guaranteed to be absolutely airtight you might want to look at Schott laboratory glass bottles, but that will set you back 50 bucks for a 1l flask.

micksmelanie:
Inside the shoe box I put 3 sachets of 2g silica gel but it’s not airtight and I don’t know how many days the silica will resist. I put the 3 sachets last Wednesday

Help me find the best method of storage and protection from moisture condensation when there is no ziplock and no silica gel

I saved the video game cartridge inside the antistatic bag and left the bag open because there is no space to put silica inside and this antistatic bag I put inside a closed shoe box with 3 silica sachets inside the box

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