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Series Foam

Can castable, rigid urethane foam be frozen without damage?

Specifically, Smooth-On brand Foam-IT! series foams, preferably the 3 to 5 lb density ones. (http://www.smooth-on.com/Rigid-and-Flexible/c10_1122/index.html)
This is for a lightweight, box-supported mother-mould to a brush-on silicone mould, large-ish (about 30"x14"x3"), which will be used to freeze ice. I would be re-freezing this a couple of times, probably no more than 5 times over the life of the mould though. Trying to minimize cost while maximizing portability/ease of storage.
(Please note, I am not asking if the components of the compound can be frozen and used, I am asking if the fully cured and cast foam can be frozen/thawed without breaking down, expanding/contracting excessively, or otherwise being damaged. Also, because I'm using a food storage freezer for freezing, if it will release anything toxic into the freezer air, that would be good to know also.)

Thanks!!!

I would expect any rigid structure to be unlikely to survive the expansion of ice as it freezes as the 9-10% increase in volume would put great pressure on it, more than the silicone mother mold could take up. Not because the freezing would damage the material per se, although it would be likely to make it stiffer with colder temperatures. I would consider it a tricky problem and would look to making a 5 sided box of panels held together with large elastic bands (cut from innertubes) so the sides can be pushed out while still supporting the silicone inner mold.
I haven't done this, just have a variety of experience with freezing and expansion and molding.

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