stupac2
Well-Known Member
Well, industry standard for what? Cans probably have close to no ingress. At any rate I'm doing a little project on this and there is some paper somewhere that I read recently that described oxygen ingress through at least wine corks, but I can't find it right now and don't have time to dig through. When I get time and remember I'll get back to you, but suffice it to say I found that surprising as well. Though, if you think about it more, it's not particularly surprising because gases diffuse through plastics. Traveling on the order of a few mm (which is probably the diffusion barrier on a cap) is something radon can do in a week or two, oxygen is probably an even better diffuser just because it has a smaller radius. (I work with radon a lot so I know this well, and then am making some assumptions about comparing it to oxygen that aren't particularly well founded but are close enough to make me think they're okay.)Never heard about that mL of O2 per year thing but that sounds like a lot. I believe the industry standard for DO at packaging is under 300ppb for most styles.
As for overselling how bad O2 is that may be the case with lambic, I'm not sure. It would be interesting to do a study on the bugs and the oxygen intake in the barrel but that would go way more in depth than a beer forum discussion. I will say though, I've done some sensory analysis with some lagers and pale ales that were oxygenated (barely above the threshold) on purpose and the flavor change was very noticeable. On the other hand, the majority of us could not tell the difference between several macro lagers with distilled and deoxygenated water added.
Wine corks absolutely let in oxygen, if you think about it at all there's no way they wouldn't. You've got a compressed agglomeration of natural particles being held in with friction, of course there's a diffusion path through there. As above a quick search didn't turn up the citation I had for this (because I am not very organized with this yet) but oxygen definitely gets in through wine corks and IIRC without it wine wouldn't age the way it does. Oxidation is not all bad! Also, oxidation can happen without oxygen! The confusion about this out there is annoying. So you're right about that, at least as far as I know.Side note, I got into a debate with my stepdad over christmas. He was arguing that wine corks don't let in any oxygen (or at least they shouldn't) and the tired "let it on its side to keep the cork wet" adage I've heard a lot. My understanding from reading on these boards is more in line with what you said. Essentially oxidation is inevitable over time and that you are essentially hoping for "good" (depending on your tastes), controlled oxidation. Is that correct?
As for the cork being wet, I don't really know. It's definitely the consensus in the wine world, and I don't care enough about wine to really look into it thoroughly. But even stored on its side wine corks will lose elasticity with time, that's just inevitable. Maybe someone here knows if it actually matters, all I know is that it doesn't for beer. Wine is a different beast.