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Old 04-06-2009, 07:53 AM   #1
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Default Oxygen uptake in plastic fermenters?

I've heard JZ mention this can be a problem with long term fermentation (e.g., Barleywines). Anyone have any actual data on the subject?

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Old 04-06-2009, 02:39 PM   #2
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This is a good thread. I'll try to dig up the links later today, but I think when I tried to run the numbers last I found that the amount of O2 coming in through a PET bottle would be pretty negligible compared to what diffuses through a rubber stopper and the water in an airlock. It'd be nice to check again and get others to look at those numbers, though.

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Old 04-06-2009, 08:17 PM   #3
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Very interesting. I'm really looking forward to what you found.

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Old 04-06-2009, 08:51 PM   #4
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I can pretty confidently say that if you're _really_ worried about O2, you should go with something like a corny keg where you can use CO2 to purge the head-space and have a fairly impermeable container with (especially) no rubber/silicone/water surface area (all of which have decent O2 permeability).

I'll look for the papers I found later tonight.

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Old 04-07-2009, 07:47 AM   #5
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Material


Oxygen Permeability cc-mm/m2-day, 23C
Wood, Oak 57
High-density polyethylene HDPE 18
Polypropylene PP 20
Polycarbonate PC 36
Nylon (not oriented) 0.62
Saran 0.02
Vinyl 20
Silicone 10600
Water 34400




Tank Volume [L] O2 cc/L.year
Burgundy barrel 300 8.5
Rodenbach tank, wood, small 12,000 0.86
Rodenbach tank, wood, large 20,000 0.53
HDPE bucket 20 220
Homebrew barrel 40 23
Glass carboy, 30cm vinyl immersion tube 20 0.31
Glass carboy, silicone stopper 20 17
Glass carboy, wood stopper 20 0.10

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Old 04-07-2009, 04:54 PM   #6
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Fantastic info. Do you know the source?

MAJOR THANKS.

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Old 04-07-2009, 05:36 PM   #7
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Quote:
Originally Posted by ipscman View Post
Fantastic info. Do you know the source?

MAJOR THANKS.
Brewing Flemish Red Ale, by Raj B. Apte
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Old 04-08-2009, 04:53 AM   #8
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Thank you for making time to find this.

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Old 04-08-2009, 05:45 AM   #9
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Quote:
Originally Posted by z987k View Post
Material


Oxygen Permeability cc-mm/m2-day, 23C
Wood, Oak 57
High-density polyethylene HDPE 18
Polypropylene PP 20
Polycarbonate PC 36
Nylon (not oriented) 0.62
Saran 0.02
Vinyl 20
Silicone 10600
Water 34400
Wow that is impressive impermiability for saran. Maybe I should just wrap my plastic fermenters with it.
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Old 04-08-2009, 10:27 AM   #10
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Originally Posted by ipscman View Post
Thank you for making time to find this.
I've had that site bookmarked for quite some time. When you brew enough, you just have this massive list of things you can go reference for information. And you find that some sources can be very worthless (anything written by Mosher).
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