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Question: How small of a micro feature can be molded on a medical silicone part? Answer: Silicone feature size is limited by the geometry, tooling, and process. Silicone will replicate surface finish features with less than 0.0005 inches in size. Features larger than 0.005 inch can often be manufactured with some considerations. Part geometries such…

Question: What is the difference between part removal in medical silicone injection molding vs. medical plastic injection molding? Answer: Part removal is dictated by the size, shape, geometry, material, and surface finish. In both processes the use of an automated handler or manual handling can be used to pull some types of parts directly from the…

  Question: Why is aluminum and not steel used to build prototype molds for molding medical silicone parts? Answer: Aluminum is used to build prototype molds because an aluminum mold is easier to machine than a steel mold. As a result, the aluminum mold can be built faster than the steel mold which leads to a…

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  Question: What are the differences between designing a medical silicone part vs. a medical plastic part? Answer: The largest difference in design between silicone and plastic is the properties. Understanding the application and the material properties can help designers better utilize silicone in all applications. Silicone and plastic both have implantable and non-implantable grades and…

  Question: Why do you have to clean the barrel and feeding system in medical silicone injection molding when changing the material? Answer: Cleaning the barrel and feeding system is essential in medical silicone injection molding because it significantly reduces the risk of contamination during the molding process. In thermoplastics injection molding, the barrel is…

  Question: What is the shelf life of uncured medical silicone? Answer: The typical shelf life of uncured medical silicone may range from 6 to 24 months; it is normally labeled with a “best use before” date. If the medical silicone has passed the recommended date, it still can be mixed, molded, and used. However,…

  Question: When molding medical silicone parts in the same mold will changing the durometer change the dimensions of the molded part? Answer: The final part dimensions will depend on inherent shrink rate and processing conditions. Different materials molded in the same mold with the same shrink rate should produce the same size parts. Click…

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