| General > General Technical Chat |
| preserve electronic devices |
| << < (8/9) > >> |
| CatalinaWOW:
--- Quote from: coppice on November 11, 2020, 03:33:02 pm --- --- 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. --- End quote --- I'm impressed. As I said, I wouldn't have bet on that result. My personal experience has been about a quarter of them last more than a year. Maybe I got a bad batch, or the wrong brand, or am not careful enough to keep the ZIP-LOC faces clean or ..... My sample size is small, but because of the poor results I wasn't encouraged to try more. Air gets in easier than water by the diffusion path. For leakage paths there is no meaningful difference. |
| classicsamus87:
Honestly I don't know what type of ziplock bag I should choose but I don't have a vacuum machine and the zip is interesting and easy to open but it can't get in moisture |
| SilverSolder:
The plastic that a zip-loc bag is made of, is not a perfect impermeable membrane. I found out the hard way, filling a ziploc with a mixture of ethanol and cedar oil to rejuvenate some closet cedar "smell fresh" blocks... The liquid was able to sweat through the bag! Good thing I was paranoid and had the whole thing in a glass bowl... |
| classicsamus87:
Which ziplock bag material is waterproof? I need to buy ziplock that does not enter moisture |
| SilverSolder:
--- Quote from: classicsamus87 on November 27, 2020, 01:03:11 pm --- Which ziplock bag material is waterproof? I need to buy ziplock that does not enter moisture --- End quote --- The mylar bags that electronic components are often shipped in is probably as good as it gets? |
| Navigation |
| Message Index |
| Next page |
| Previous page |