I hadn't even considered the permeability of barrels, good point


"A. J. Rawls" > wrote in message ...
> About as much permeability as a barrel? Less I think.
>
>
> On Sun, 7 Jan 2007 15:37:49 -0000, "jim" >
> wrote:
>
>>Fair point, but I suppose it depends on the ratio. I have emailed better-bottle to see if they have any more specific
>>stats for internal carboy surface area and 02 exchange across the PET material.
>>
>>I can't help thinking that if the PET walls truly do suffer only 'negligible' 02 permeability, by definition they are
>>as
>>low risk as using a rubber bung (which probably has greater permeability but lower surface area). Interesting thread
>>though
>>
>>Jim
>>
>>
>>"Kirk Mitchell" > wrote in message
groups.com...
>>>
>>>
>>>>
>>>> Is it not the case that rubber is hundreds of times more permeable than
>>>> either, and thus the degree to which a long-term storage wine oxidizes
>>>> in the carboy is really not significantly altered by the vessel, since
>>>> most of the permeation of O2 is going to occur through the rubber?
>>>
>>> I don't recall seeing any study that would confirm your assertion.
>>>
>>> If it is true, though... regard the surface area where the permeability
>>> would occur. 3-4 square inches at a bung, or massively more over the
>>> surface area of a carboy.
>>>
>>> Kirk
>>>
>>
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