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Home Brew Forums > Home Brewing Beer > Beginners Beer Brewing Forum > O2 absorbing caps?
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Old 11-12-2010, 12:56 PM   #1
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Default O2 absorbing caps?

How effective are these? They cant absorb oxegen forever and its not like they have to be activated prior to being put on the bottle. It would seem they would start working as soon as they roll off the production line and stop working at some point. So how effective could they be? Is there something Im not understanding here?

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Old 11-12-2010, 01:41 PM   #2
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They absorb oxygen when they are wet.

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Old 11-12-2010, 02:50 PM   #3
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Once you bottle with them, they will get wet, which starts the O2 "collecting" (I don't think they actually absorb O2 as much as modify it in some way. I mean, they can't really just "hold on" to O2...).

The process takes a while, so you are not going to ruin them by spritzing with sanitizer just before capping.

I got some when my LHBS didn't have the regular caps and they seem to be ok. I have not tried them long term enough to know if they are better for preventing oxidation than regular caps, but the price difference is not enough to make me want to use the regular caps anyway.

The best thing you can do to prevent oxidation is to handle your beer properly during the fermentation and bottling stage. Minimize the exposure to O2 by not splashing, and blanket your containers with CO2 if possible. And "cap on foam" which pushes the O2 out of the bottle just before the cap is pressed on.

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Old 11-12-2010, 02:59 PM   #4
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I had a possible oxidation problem with a batch of homebrew, and I decided that the price difference was so little, and homebrew so precious (time and money), that these caps are totally worth it if they work even a tiny bit.

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Old 11-12-2010, 04:09 PM   #5
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What do you mean by cap on foam?

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Old 11-12-2010, 04:51 PM   #6
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"Cap on foam" refers to litterally putting a cap on a bottle when foam occupies the head space. Since foam is a little beer and a lot of CO2, the CO2 displaces (pushes out) the oxygen left in the headspace. The foam will then die down and you will have a lovely headspace full of CO2. Ahhh, nothing like a little CO2 cloud when you crack open that homebrew.

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Old 11-12-2010, 04:53 PM   #7
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Quote:
Originally Posted by Butcher View Post
What do you mean by cap on foam?
It's probably hard to do with uncarbonated beer but when bottles are filled with carbonated beer the standard practice is to agitate the beer causing enough foam to fill the headspace (and displace oxygen) and then cap. Commercial filling lines do this by squirting a small amount of water into the beer, homebrewers do it by smacking the bottle in some fashion.
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Old 11-12-2010, 08:55 PM   #8
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I bottle on starsan foam.

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Old 11-12-2010, 09:36 PM   #9
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i had some various cases from my kegs bottled up to ~6 months with o2 caps and didn't detect a problem aside from my bottling method losing half the carbonation.

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Old 11-12-2010, 10:35 PM   #10
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Quote:
Originally Posted by mlg5039 View Post
I bottle on starsan foam.
I never use star-san in packaging because...

What's inside the bubbles?
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