Question: In your prototyping experience, are you capable of over-molding medical liquid silicone onto thermoplastic materials? If so, what is the lowest melt temperature material that you have been successful without deforming the substrate (ABS, Nylon, Polycarbonate, etc.)? Additionally, do you find that a silicone primer is always necessary when over-molding?
Answer: In our experience, we have had success bonding medical silicone with certain thermoplastic materials. Since different types of materials require different temperatures to work with, it would solely depend on that specific material. Over-molding medical silicone to plastics is limited to either using low temperature or faster cycle time. Plastic substrates would not deform under low temperature, but it will increase the cycle time during the over-molding process. In contrast, using high temperatures can lower the cycle time, but can potentially damage the plastic substrate. Using silicone primer helps the over-molding process, there are some other options available such as adhesive grade medical silicone and surface treatments.
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