Quote Originally Posted by Blooze View Post
The only thing that concerns me is that most of the cubitainers I've ever used were LDPE, which is gas permeable which might defeat the purpose?
I can get amber PET bottles fairly cheap in various sizes. They are at least less gas permeable.
Many plastics allow oxygen atoms to pass through, ruining the developer sooner.
Most plastic foils used in the food industry use, besides the main material (whether LDPE or other) a sophisticated sandwich of barrier layers aimed at blocking... oxygen. I have wine bladders set aside for storing developer, and they have a metallic appearance, probably a submicron thick aluminium layer. The oxygen barrier may also be a special polymer, also generally submicron thickness. I would rely on the 100's of man-years of R&D invested by the food and polymer industries. If in doubt, run control strips at regular intervals.