Re: [DIYbio] What freezer for a starting DIYBio lab?

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Well, on account of Newton's law of cooling, I would expect the 35C
difference to translate to a drastic saving in running costs, and
1,200 isn't bad for a low-temp fridge! I suspect -45 is below the
Ice-I/II thresholds (which would make it pretty useful for long-term
storage), but maybe Wikipedia is the place to ask about temperature
thresholds for Ice types.

On 04/02/2013 02:05 PM, Brian Degger wrote:
> Have recently seen a down to -45C freezer for £1200. think the
> difference between this and -80 is that the -80C fridge has an
> additional freezer compressor. is -45 worth it?
>
>
> On Tue, Apr 2, 2013 at 1:15 PM, Cathal Garvey
> <cathalgarvey@cathalgarvey.me
> <mailto:cathalgarvey@cathalgarvey.me>> wrote:
>
> As in, "Lab" freezers are less likely to *trigger* an explosion,
> or are more likely to *survive* or even *contain* one?
>
> In any case, I stand corrected then; some lab freezers may have
> useful features domestic ones don't. It would seem though that this
> feature is of little relevance to DIYbio, where ether and other
> highly volatile explosives are less commonly in use (with the
> noteworthy exception of chloroform..).
>
> On 04/02/2013 10:56 AM, Eugen Leitl wrote:
>> On Mon, Apr 01, 2013 at 08:30:48PM +0100, Cathal Garvey wrote:
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>>>
>>> Kitchen freezer without auto-defrosting would be perfect,
>>> although Mega's advice is good: stuff the freezer with
>>> "thermal mass" (ice-cooler-packs) so its temperature stays
>>> fairly constant despite
>>> opening/closing/powercuts/defrosting-cycles-you-didn't-want.
>>>
>>> "Industrial" equipment and "lab" equipment is sometimes
>>> valuable, and sometimes just a ripoff designed to scare
>>> beaurocrats who don't understand what they're paying for; when
>>> asked to buy a freezer for a lab by a PI, a bureaucrat is going
>>> to assume that a "lab" freezer has some magic special sauce a
>>> normal freezer doesn't. I have yet to learn of a magic
>>> freezer.
>
>> There's one major difference between consumer and lab
>> refrigerators: latter are explosion-proof (sparkless). If you
>> ever had a fridge full of ether vapor blow up on you, that's a
>> very useful feature.
>
>
>
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