Definitely PVC
Iron is to shirt as steam is to pants.
Iron is corroded in steam.
On Vinyl and PVC floors and Linoleum steam is OK
Yes, but PVC creates problems
These days PVC pipes are faster and easier to fit and in many ways more efficient than cast iron.
Pvc pipes are cheaper. They are easier to join. They last longer.
PVC plastic is one type of pipe that does not contain iron.
The standard iron for clothing was created by Henry Seeley in 1882. It was the Eldec Company that created the steam iron in 1926.
An iron that uses steam to make to fabric more malleable before heating it to flatten it out
Fe is the chemical symbol for iron. When iron reacts with steam it corrodes, or rusts.
No PVC is acceptable, you can join the new PVC piping into the existing Cast Iron.