[hackerspaces] liquid based non expanding insulation - name?

B F bakmthiscl at gmail.com
Thu May 31 19:39:24 CEST 2012

The non-expanding version is available as the "blue" can of "Great
Stuff" (at Home Depot in the USA).

Alternatively, use different forms of insulation, such as glass-fiber
insulation with polyurethane foam only in spots.

Note that if you use the expanding version alone, you will do best to
determine how much you need to fill the space, then only use that
much.  This stuff exerts considerable pressure as it expands.  If it
were my task, I'd get a disposable 1-l bottle, add the foaming liquid
to some specific weight, let it expand, then determine the final
volume by difference divided by the weight of liquid used.  After
that, it's comparatively easy.  But be aware that the hardening foam
will not distribute itself like a liquid, so it may be necessary to
add it in stages anyway.

On Thu, May 31, 2012 at 11:00 AM, Frantisek Apfelbeck
<algoldor at yahoo.com> wrote:
> Hi to all,
> I need to insulate around 5-10 cm space all around an inner polyethylen (PE)
> box (5 mm thick, cube, a=500 mm) and between it's outer MDF board based
> shell (12 mm thick, cube, a=600 mm). The device is going to be an
> experimental incubator, so temperature insulation is crucial. I have tried
> to use polyurethane foam but it is expanding therefore it would distort the
> soft PE internal layer. I used partly a polystyrene board for the back but
> the boards do not fit exactly (thickness) and due to the fact that I used
> screws and brackets in the project a lot it would be hard to put the boards
> in anyway.
> The best thing in this moment would be to fill the spaces between the boxes
> with some liquid un-expanding insulation which would get in all the spots,
> become firm and I would be fine. The plan is that I would insert the inner
> PE box, fasten it, flip the whole box on it's back side and fill the gap
> between PE box and MDF box up with the insulation and "happy ever after".
> Alternatively would you know if it would be feasible to brake down the
> polystyren boards on a small pieces and mix them with some glue and apply it
> in a similar manner? My budget for the insulation is $20-40 and I'm now in
> Seoul South Korea.
> Thanks a lot for any help! It is a prototype so a great learning experience
> but I have spend more than 20 hours on building two smaller size simple
> boxes - bit slow I would say.
> Sincerely,
> Frantisek Algoldor Apfelbeck
> biotechnologist&kvasir and hacker
> http://www.frantisekapfelbeck.org
> "There is no way to peace, peace is the way." Ghandi
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