I also can speak from personal experience that PVC is the way to go.
Awhile back I was working on a project involving PVC pipe. I accidentally knocked the heat lamp over on my bearded dragon cage (Which is a PVC cage made by Animal Plastics) with the end of a long piece of pipe. The heat lamp was and still is on a thermostat, but the thermostat couldn't have prevented what happened next. The thermostat ramped the bulb up to full power to try to heat the cage back up, the heat lamp had a 150 watt halogen spot bulb in it so this really was about as bad as it could get. The bulb was making direct contact with the cage. I actually didn't notice it until I smelled melting plastic but by that time 15 minutes had passed. (I was going in and out of the house)
This was the only damage from direct contact with pretty much the most powerful bulb used in the hobby after 15 minutes:
The inside of the cage was fine. the top 1/3 of the PVC sheet melted and bubbled but the rest was intact.
You can get just about anything to burn if you get it hot enough, the difference is if it will hold a flame after the heat source is removed and how quickly it will burn if it does catch. With PVC the cage will melt before it holds a flame. While a melted cage isn't ideal and its not 100% fire proof it is about as good as it gets.
The material your cage is made with matters. This instance is one of the reasons why I stay away from the thinner plastic cages like boaphiles. That bulb would have gone straight through the cage.
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