On Wed, Jan 20, 2010 at 05:42:26PM -0500, Mark Stanley wrote:
> On Monday 18 January 2010 22:16:00 Gabriel Paubert wrote:
> > On Mon, Jan 18, 2010 at 09:00:35PM -0500, Mark Stanley wrote:
> > > I'll get you the information tomorrow when I get back to work. For long
> > > term storage we keep it packed with dry ice (CO2) in the freezer and
> > > store the in- service tube in the refrigerator. We've had in-service
> > > tubes last up to six months.
> >
> > That's a single component, right? They typically need -20 or -40°C for
> > conservation from what I've seen.
>
> Yes. I'm using H20E in a single syringe. It's packed in a small cooler and
> surrounded with dry ice then covered over with balled-up newspaper and then
> the
> lid is taped shut. It has already lasted several years in the freezer.
Ok, so it's H20E (as I said it looks like the industry's workhorse). Just had
an offer from another distributer in Spain, and it's €380 for an ounce (non
premixed).
In theory, non premixed should last longer, although room temperature
conservation is recommended. I can't understand why it would not conserve
better at a lower temperature: there is a potential crystallisation problem
but it can be solved by heating the individual components to 50°C for a few
hours before mixing.
The problem is that room temperature can be very high in summer in
the south of Spain and the air conditioning may be cut-off, especially
during the week-end. Apparently, the worst scenario is repeated temperature
cycles, and I'd rather avoid it.
Well, I think I'm going to buy some H20E and see how it works out. It can't
be worse than CW2400...
>
> You mentioned only having a small fridge but you should be able to set the
> controls so that it will actually freeze.
The solder paste and other products I have in the fridge needs 0-5°C for
best conservation. The lab is already really full and I don't want to
mix chemicals and food in the same freezer.
Gabriel
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