Well it greatly differs on the chemical makeup of the PVC that you are using. For example the Controlled Density PVC using an Animal Plastics cages is completely UV resistant, while the PVC used in schedule 60 pipes isn't. Even still it will differ by the manufacture I'm sure.
You might want to look into a plastic called UltemŽ 1000 (PEI) it is completely UV and temperature resistant (up to 340 F without smoke, flame, or mechanical failure)
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