[pure-silver] Re: storing developer solutions

From: David Foy <dfoy@xxxxxxxx>
Subject: [pure-silver] storing developer solutions (was Re: Re: HC 110 question 
...)
Date: Tue, 30 May 2006 12:56:20 -0600

> These bags work exceptionally well. You can exclude all of the air, and 
> because they are a laminate of high-density polyester and metal foil, 
> their gas permeability is extremely low, much lower than any plastic 
> bottle with the possible exception of rigid PET. I base this statement 
> on what the manufacturers say about the laminate material, and what 
> bottle manufacturers say about PET and HDPE. It's all googleable for the 
> curious.

Mylar is a trademark and the material used for Mylar products is
PET. I'm surprised that the bag/bottle manufacturer didn't tell you
that.

Gas permeability is a property of the material but the actual gas
barrier property depends on the thickness IN ADDITION to the
material. So thick PET bottle is better than those bags, as long as
air is not allowed in the bottle.

One common way to increase the barrier property is to use foil
lamination. Unless it is further laminated, puncture resistance may be
compromised. Well made aluminized PET bags are quite good.
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