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Turkish
Lots of naked carbon out there, the nudity doesn't seem to be a primary cause of failure. Interesting anecdote via Leonard Zinn
"Our R & D director...took some of our hockey shafts and fabricated a rooftop carrier for his car. He drove that around San Diego for five years. We took the rack down and performed our standard 3-point bend test...There was no decrease in strength or stiffness after five years on top of the car in Southern California sun and heat"
Since UV degradation is a long-known problem with polymers, a huge amount of R&D effort has gone into making them more stable.