Hi guys,
I am very sorry for the late response. My crappy tablet computer crashed over the weekend. I'm buying a used mac from a friend tomorrow to get myself back in the game, I'm borrowing it to make this post.
I am trying to skim this thread at least, and the other one too, but I'm only half way through. And I have already shared your pics with our engineer.
None of the parts shown are plastic or melted. The "melted" looking part is actually a silicon adhesive used to attach the fibrous airtube to the threaded metal base. The "plastic" ring at the bottom is also silicon, and sometimes it gets stuck in the silicon before it dries. If you take apart an empty, unused carto it will look exactly the same.
Both the ring and the adhesive are high temperature silicons which do not outgass or melt under heat. They are not burn proof in flame, but they don't melt or deform as they burn. I've tested that. I am waiting on specific material names and MSDS sheets in english.
As far as a suspect in causing the burnt taste, I doubt it. But we will be dissecting all cartos as we test, so I'll make sure we look for any burning or discoloration on the silicon parts as well.
Cryx, thanks for bringing this up, and please continue to point out anything else you find. It would be nice if we could point