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There are (usually) no molds solely made of epoxy. The epoxy is all ways reinforced with either glass, or carbon fibres. The advantage of a cte close to 0 only occurs when using carbon. Good moulds, especially infused ones, or prepreg molds, last very, very long. If you are willing to repair some defects from time to time, and don't abuse the mold, several hundred pulls are possible.
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