James-

>I have identified  four important characteristics of the resins used to 
>make bottles which are important  to CS storage therein.  There may be 
>other parameters too, but these seem likely to be the most important.

I like your taxonomy of plastic characteristics. Over here in the UK,
I can buy lab water with a specific microseimens rating on it.
It occurs to me that the plastic that they ship this water
in must have special properties. Otherwise, it would taint
the water?  I don't know the composition of the plastic
but I do know that I save all of these containers that I get 
my hands on. . .  for water and CS storage!  But I can't
exactly make batches in them -wrong shape

cheers,
Steve King


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