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What are they for?
I've no real idea, but here are some thoughts:The "draft angle" could be very important. That's the amount of taper on the sides of the container. The greater the angle, the more likely the ice will tend to move up the container as it expands, rather than explode the container.The friction between the ice and the container could be very important. If the ice can slide up the container as it expands, it's less likely to explode the container.I think polyethylene containers (if that's what Tupperware is made from) might be good from a friction point of view.
Karsten they make this rubber like bake wear you can buy these days which would allow you to use like a large bread loaf pan made from this pliable rubbery cookware that I am sure can be frozen and then just flip the pan wrong side out to remove the cube.. I will look for the name of the stuff!......ok its silicone bake ware see below.[attachment=11361]
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