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Old December 3rd 04, 09:42 PM
jc
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Ron Natalie wrote:

snip

Rubber is porus. The mylar (what you are calling aluminum) isn't.


Actually mylar is porous hence the aluminium layer. Most plastic films are
porous even to largish molecules hence the use of an aluminium layer in any
sachet packaging where this may be a problem.

--

regards

jc

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