[log in to unmask],Net writes:
> they say only a 2-6degC range is guaranteed. (So why did the FHSA not
> spot that when negotiating their job lot in 1995?)
>
you might well think ..... but I could not possibly comment
> Anyone else found similar probs? Anyone else (besides Jeff of course)
> actually *aware* of the 2-4 degC range? And what do you do?
I undertook a little research with a professor of organic chemistry,
locally.
At the bottom of my domestic deep freeze (bear with me, all will become
apparent) there is a half gallon container full of water and salt.
At -20 degrees celsius it is mostly solid.
When the power fails the container stays at -20 deg C, but steadily
changes state over a period longer than any power cut has yet been.
(In 1999 I may put an extra one in)
So, I thought about a similar freezing mixture for the range >0 to <4
deg C. I take little interest in the quoted lower limit of 2 deg,
since this surely only means that it should not be frozen.
The compounds available with a sluch range in that range, and suitable
for enclosing in a multi-layer sandwhich which we can make a box out of
are limited, and once we demand they are cheap, safe, and don't blow up
the candidates are further restricted, however, using physical
chemistry rather than engineering is an attractive solution to the
problem.
You will immediately notice that if the stuff is made as a box, it will
protect the vaccines when they are out of th efridge and sitting on a
table ready to be used....
Of course, it may be time we moved to the dead injected vaccine instead
of the live oral vaccine.
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