Both are plastic materials claimed to be biocompatible by their manufacturers. Unfortunately, there is no evidence (yet) in the form of independent testing to support these claims. As with PTFE, these materials are quite soft and can easily be damaged and thus cause problems. These materials can also be broken down in the body during prolonged wear and thereby release substances that can be harmful to you. They can be used for short term wear or when you must undergo medical examination.
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