Last year we ran a contest asking for your silicone related questions and had a great response! We then had our engineers answer all of your questions and posted them on our blog, Silicone.Pro. In order to give the best service and information possible, we are again asking industry professionals to submit their silicone questions….

  Question: What is the typical flash tolerance for a silicone part? Answer: Silicone has a relatively low viscosity compared to other TPE (Thermoplastic elastomeric) or thermoplastic. The silicone’s viscosity enables us to more easily mold micro parts, but it also presents a challenge with flash. The typical flash tolerance for a silicone part is…

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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…

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