Question is in the title :)

Google search is a wonderful thing..:uhoh:

See the following link for melting point of polystyrene..

http://en.wikipedia.org/wiki/Polystyrene

i am using it to hold a projector headlight inside the entire plastic housing. it is hanging down so i thought i could stick some styrofoam in there, the problem is that i dont want it to burn or melt because the metal projector gets very hot ( when it is on, you cannot touch it without burning your finger)..

can anyone tell me what the melting points and the points when the fumes come off of different types of styrofoam

The styrofoam may serve as an insulator allowing the reflector housing to overheat and crack.

FWIW over the years, I have found ordinary plastics, Styrofoam etc will often melt when in extended contact with high-powered lighting. Can you use another adhesive? I have used Loctite Ultra-Copper silicone in high-heat areas such as exhaust manifolds with good success. It is engineered to be heat-resistant.

The styrofoam may serve as an insulator allowing the reflector housing to overheat and crack.

FWIW over the years, I have found ordinary plastics, Styrofoam etc will often melt when in extended contact with high-powered lighting. Can you use another adhesive? I have used Loctite Ultra-Copper silicone in high-heat areas such as exhaust manifolds with good success. It is engineered to be heat-resistant.

why did you say "another" adhesive lol. plastic is not an adhesive :)

why did you say "another" adhesive lol. plastic is not an adhesive :)

you are using the styrofoam to hold the light in place, hence the need for an adhesive, right?

Sytrfoam or any adhesive near a typical headlight assembly is just asking for trouble. Problems with fire could ensue shortly after dusk.

Try this...grab an infrared thermometer ($20 at the parts store) and take a temperature reading of the surfaces you intend to fix after running the lights for a while (i.e. a steady-state reading). If it can stay under about 500°F you might a have a shot with a high-temp silicone adhesive such as for exhaust applications.

There are some specialty high-temp adhesives out there, epoxy- and silicone-based that can go up to 700°F, but you'd be hard pressed to find them in the typical auto parts store. Do a little testing first to see what you're up against, then you can go and search for the best fix. Just keep in mind that sometimes it may be cheaper or alot easier to just replace the part than try to finagle a repair and hope it holds. Good luck!

you are using the styrofoam to hold the light in place, hence the need for an adhesive, right?

but the styrofoam will still burn