Interesting question. I just had numerous cable ties of various sizes fail in 40 degree heat in Morocco. By fail, I mean while trying to apply them to the task at hand they snapped, I presume that they had become brittle from the heat.
They were stored under the seat or in the panniers and not in direct sunlight and they were all black.
It could, of course, be something to do with the quality of the items?
I know some were from Halfords, but I can't be sure that they were all from there. As an aside, all those already in place keeping wiring neat have not perished.
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