Question: Why is silicone the preferred material to make molds from to cast resins?

Answer: Silicone if fully cured does not bond well to other materials and it has a relatively high elongation and low modulus which all aid part release. It has resistance to temperatures up to 500 degrees F compared to many other resins which may degrade at temperatures over 200 F.  Silicone has properties that facilitates removal of cast parts from the silicone mold. Silicone molds are also often easily reproduced from the original mold.

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