Bottle Cap Bubbling

What exactly do you mean by "bubbled up"? Do you mean the metal was misshapen or that the plastic lining in the cap had bubbled up? The thin lining that lines the cap...you know what I mean I am sure...

 

I see that now and then in lambics and other beers I've aged a while. Never had a problem with any of them.

 

I know exactly what you are talking about. The white rubbery lining on the inside of the cap is either one big bubble or it has a bunch of little bumps all over it, tiny bubbles. I have experienced both these phenomenons and have never once had an issue with the beer. I do not, however, know what causes this!

 

I'm guessing it would simply be a defective cap under pressure...or just a bad cap...I wouldn't worry...I've seen the little bubbles but never one that was too bad...never really thought about it...I'm still alive and so is everyone on this thread so we're good...lol...as long as there aren't extras floating in the beer...well even then I'd drink it probably...just think, manufacturing is a pretty sped-up process with a margin for small error, especially ones that won't hurt you...too bad at least, maybe...jk...

 

Could it be oxy absorbing caps actually absorbing a visible amount of oxygen?

 

If the air seal stays intact I don't think you have anything to worry about.

 

From a physical science standpoint I'm going to guess that when the beer is chilled and the air space in the bottle contracts, then the air behind the cap liner (or maybe it's air that is embedded in the plastic) is trying to get out to return the air space to equilibrium.

 

I'd understand that if it was a still/flat beer (like some lambic) but the beer is carbd/under pressure so it shouldn't cause a negative pressure zone in the head space.

Just my thoughts after a few beers anyway. Lol

 

I'm gonna' say that maybe I didn't think that theory all the way through.

 

Its oxygen absorbing caps… means there is a good seal on your bottle as well. The down side of this is once you start seeing this I wouldn't let additional bottles of the beer you have age more than another year… the caps can only absorb so much :/