I want a heat resistant plastic which i can vacum form to make an exhaust for a rc car. Is this possible?
No it does not, warmth and funky weakens plastic extra, the utmost warmth resistant you will get is about 650 ranges centigrade and after that they merely burn thermosetting plastics i imagine...
Not having any idea how hot the exhause from the engine on an rc car is, it's difficult to answer. My suspicion is no, it's not possible. I'd hazard a guess that the exhaust is going to be pretty hot and that the plastic would tend to deform/degrade when exposed to heat for a long time. Heat resistant plastics are just that, heat resistant, not heat proof. Meaning that they'll take elevated temperatures for a short time, but on extended exposure they still burn, warp, and otherwise do things that wouldn't be good for the application. Even if you can find something that wouldn't burn, you'd still have a deformation problem. Remember, you're talking about heat forming this part, which means the plastic has to get soft at temperature. That means that the plastic is going to get soft when the exhaust is in use and you may find that the flange deforms away from the manifold or does something else that would cause your engine to loose compression. Don't mean to rain on your parade, but there are going to be some serious engineering problems with doing something like this.
You would not be able to tune a plastic pipe and understsand that no plastics can endure the carbon and heat from a scale rc engine. No matter what the plastic the header or the block will surely melt the pipe. You can make carbon fibre pipes that work exceedingly well but your best bet for sound, air compression and oil displacement is always going to be metal.
