Hi all, long time lurker, first time poster.
I have been storing my broken down sets in original boxes inside of Zip Lock bags (1 Gallon and Sandwich ones, obviously brand new clean bags). I recently acquired 9446 set and was sorting the pieces, the brown plates are insanely brittle, have no flex at all and even a tiny bit of pressure from the disassembly tool is enough to snap off pieces of plastic and snap plates in half. To make it more clear, they are so brittle that if I laid a plate on the floor and dropped another one on top of it from a few feet up they would both shatter into a thousand pieces.
I dont know the history of the set, so I assumed sun exposure. However none of the pieces are sun bleached and only the brown pates are affected, all other pieces are fine.
Anyhow, this got me googling about proper LEGO storage (long term). And I was surprised to find a thread saying that Zip Locks and other food grade bags are a bad idea due to LEGO reacting with the plastic those bags are made of. This was the discussion --> https://www.eurobricks.com/forum/index.php?/forums/topic/142101-safety-of-long-term-minifigpart-storage-in-plastic-bags/
So I just placed an order for a bunch of 100% Polypropylene (LDPE) bags that are meant for comic books. It seems like they should be a good way to store LEGO. Right?
What do you guys use and has anyone used Zip Lock 1 Gallon and Sandwitch bags for 10+ years without issues?