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Re: Technical term for current casting method of using silicone molds and gravity
Besides all the other things like how to cut the air channels or vents in the silicone mold, the alloy mixture is probably critical. Think lead, tin, antimony and maybe zinc are all used, possibly not in same alloy.
At one of our New York meetings Rudi Kraus brought a worn mold for us to look at. I remember he stated that some additives were added to the metal to allow it to flow more freely in the mold. One of the additives was antimony, but as this was probably Neptun's trade secret he did not give any percentages of the additives.