I'm designing an electronic musical instrument and need to injection mold the mouthpiece. This is my project: Multiwind. The mouthpiece needs to be safe to go in the mouth, opaque (preferably black), durable enough not to wear excessively if the user rests their top teeth on it while playing, and maintain good dimensional tolerances in molding. Other manufacturers such as Yamaha and Roland make mouthpieces that appear to have these properties. What resin should I specify for the molding?
I would imagine that the professional mouthpieces are compression molded with Ebonite (see wikipedia article - https://en.wikipedia.org/wiki/Ebonite). My late father worked on a customer's mouthpiece with this material focusing on the vibrational properties.
If you must injection mold this piece, then you are limited to less rigid and durable materials, because they need to flow down the channels of the injection molding device. Plastic utensils are made with polystyrene and a pigment can be added to turn it black.
I think I found a material. Protomold suggested looking at their list of medical grade injection molding resins. The best one for my requirements seems to be Makrolon grade 2458-550115. It's clear but can be tinted black and remain medical grade, and it's tough and molds with good accuracy. This is probably what I'll go with. If anyone thinks this is not a good option please let me know.