Yes...If I remember correctly in the mid 80's Scubapro originally said their plastic second stages were made from "graphite epoxy resin composite material" or something to that effect.Dan Gibson:Plastic has such a negative conotation. I think manufacturers would prefer you to use more exotic terms like composite and ceramic
Now they are much flashier and state that they are "precision molded carbon fiber and technopolymer valve housings". That sounds so much sexier and higher tech than "plastic".