[pure-silver] Re: Calling All Chemists
- From: Peter Badcock <peter.badcock@xxxxxxxxx>
- To: "pure-silver@xxxxxxxxxxxxx" <pure-silver@xxxxxxxxxxxxx>
- Date: Tue, 11 Feb 2014 14:09:08 +1100
After recently experimenting with telfon/gas/plumbers tape on the thread of
PET bottles I was amazed to discover that the PET slowly lets oxygen
diffuse through. This is why you won't see beer or wine in plastic PET
bottles as they would oxidise too fast. I then got the idea from an APUG
member to use the silver bladders specifically made to keep oxygen out. In
OZ I found this
product<http://www.noblebeverages.com/why-pureau/product-range/>,
a 5L cask of pure water. I use the water to make up my Dektol or Xtol and
store the stock back in the bladder !
Glass is better from a gas permeability point of view but you still must
ensure you have a perfect seal on the cap plus you need to squirt in an
inert gas (or marbles) or transfer the sol'n to smaller bottles as you use
it. With the bladder, its size deflates as you use it !
Here are some permeability values for Oxygen and CO2 for various plastics.
http://www.apug.org/forums/viewpost.php?p=1477080
Regards
Peter
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