The smaller sizes are more flexible. Colder temps affect flexibility.
Flexible PVC
I was in the PVC pipe manufacturing business for over 30 years and have never heard of a "1K PVC" pipe. If "1K" means a 1,000 psi pipe, this does not exist as a commercial product. Sorry.
An instrument made of PVC pipe.
A pipe cutter is the best tool to cut PVC pipe.
Yes
An instrument made of PVC pipe.
With a PVC locator
If you are revering to PVC as in "PVC pipe" or "PVC clothing" then is stands for Polyvinyl Chloride.
Not plumbing pvc pipe, but pvc pipe made especially for wiring.
Depends on what king of PVC and what's the concentration of the acid. For example the 35% HCl damages the flexible PVC on 50°C, but the rigid PVC not... (The flexible PVC become rigid I think.)
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Yes.