[pure-silver] Re: storing developer solutions

Ryuji Suzuki a écrit : 
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.

Hi !
As a French, I am accustomed to wine makers, and wine transportation.
When one goes to a wine maker and want to buy wine cheaply, the solution is to buy 33 liters at a time in one of these bags called a "cubitainer" which I think is a trademark. When at home the guy has to bottle it as soon as possible because the wine will turn bad in a couple of days.
I will not put my products in such bags (if they're the same as yours, which is unclear) and ask for permanence or air resistance.... If it's wrrong for wine, it's not good for HC110 ;-) Afterwards, there is also sulfite in some wines ;-)
I've devised the density of HC110 concentrate by wheighting a full new 1 litre bottle and an empty one. This sunday I'll make some experiments using a triple beam balance and let you know how it goes.... (it is easy to wheigh out because I use 1500 cc of chemistry in my Jobo tank used outside the CPE2 ! (this helps for getting big arms))
HAve a nice day !
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