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PVC cracks easier and doesn't last nearly as long with the traffic and it's much more efficient to weld I have leanred because you don't have to worry about the PVC cracking.
on the other hand that black sewer pipe stuff does get used sometimes, I wish it was more common/cheaper because it's pretty thick and durable but way lighter then a steel snowmaking pipe
Pretty sure the main reason they dont is because the good pvc pipes are more expensive and pvc is harder to work with if you are trying to make an interesting rail.
From my experiences, a new pvc tube is way more slippery than metal. But I see what you mean because the pvc would get all rough after a few weeks of having it out in the park.
I work at a small resort in norway and we have 4 pvc tubes, and they cost way less. They are quite beefy. About 5cm thick. They are labled as "blems" but there is really nothing to notice. They cost 500 Nok (Norwegian Kroner) each meter. Its stupid becaus you can only get them in 6 meter. And a normal 6 meter rail would usually cost 15000 Nok.
They are more durable than metal tubes or tankers, as they don't get dents.
They slide good but i like the feel of metal. And i tend to hook a lot more on tubes.
PVC has a working temperature above freezing meaning that it becomes compromised below freezing and is susceptible to cracking and shattering. If a resort is using PVC in their parks that sketchy af.
it'll break if someone lands on it too hard in the cold
ruined if the cat touches it
looks unprofessional
gets mad burrs
paint doesn't stick well
warps in the sun