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Thermal coefficient of expansion for aluminium is 22.2 (10E-6/K), unfilled epoxy resins are 45-65, most plastics are around 80-200 or so.
If you have a mold made from aluminium, fill it up completely with another material which has a larger coefficient of expansion and then start to heat the whole thing, the other material will expand faster than the aluminium and produce an enormous pressure inside the mold. So the whole trick isn't finding the right silicone for this (most likely the reason silicone is used is 1. its non-stick properties and 2. its heat resistance) the problem is rather being able to fill the mold completely without leaving too much empty room. I don't think you need a special silicone for this, standard material will work.
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