Question: Do I need different molds to have the same geometry parts made in different durometers of silicone?
Answer: For the same part geometry, different durometers of liquid silicone can be made using the same mold. Part dimensions should be scaled to compensate the shrinkage after silicone molding. Different durometers have different shrinkage values. If the overall part size is small (less than 0.500 inch), the impact of the shrinkage value would not make a significant difference. In addition, if the part has a larger tolerance, the same mold would still meet the dimension specifications. In some cases, different durometers of the same grade material even have the same shrinkage values, the same mold can be then used for all. During prototyping stage, getting a feel of the part with different durometers can become more critical than meeting a tight dimension tolerance. Therefore, the same mold can be used to produce the same part geometry with different durometers.
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