Very interesting. Maybe we get more intense sun here.

We only get down to 18°F here usually, and not for very long. All of my PVC that's in use for water is insulated or buried below the frost line. My 1/2" PVC hoops are not used for anything aside from being support for poly or shade cloth. Maybe that helps them last longer, but I have plenty of pieces just leaning against the shed.

I'll try to cut one of them with my PVC cutters today when I get home. I know my 3/4" PEX is toast... I stepped on it and immediately regretted the mess of plastic bits I made for myself to clean up.

Maybe half inch PEX holds up better, too.

I'm going to put some lengths outside, for science.