Do I need different molds to have the same geometry parts made in different durometers of silicone?

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.

If you have any other questions you can comment or ask me directly at veasna@albright1.com

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About Veasna

After interning for more than a year at Albright Technologies, Veasna gained experience in many aspects of silicone manufacturing including understanding of materials, mold making, and silicone molding. Veasna received a Bachelors of Science in Plastics Engineering from University of Massachusetts in Lowell in 2010, shortly after he accepted a full time position at Albright Technologies. In the spring of 2011, he received a Graduate Certificate in Plastics Design from UML. Veasna is mainly responsible for managing customer’s projects which begin from signed purchase orders to accepted and on-time part deliveries, he is also actively involved in research work on silicone bonding.