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 oups.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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