Hopefully, this is the appropriate place to post this. Might anyone here either know, or know where to find, the relative UV resistance between ABS, PVC and CPVC pipe? I want to make some simple plant supports for use on my hillside and these are light weight enough, relatively inexpensive, easily brought to their places on the hill and easily assembled.

Does anyone know how durable they are, relative to one another, when exposed to sunlight and heat? Thank you!