1) Butene 2) Butylene 3) Polybutene 1) Polybutene 
Polybutylene (polybutene-1, poly(1-butene), PB-1) is a polyolefin or saturated polymer with the chemical formula (C4H8)n. It should not be confused with polybutene, a low molecular weight oligomer. Polybutylene is produced by polymerisation of 1-butene using supported Ziegler-Natta catalysts. PB-1 is a high molecular weight, linear, isotactic, and...
A type of plastic pipe (often gray in color) sometimes used in domestic water supply systems. Some polybutylene plumbing systems are been recalled due to a history of leaks and failure.
[n] - a polymer of butylene
A polymer prepared by the polymerization of butene as the sole monomer.
polybutene noun a polymer of butylene; used in lubricants and synthetic rubber
This is a soft, gray or blue plastic pipe that was widely-used from the mid- 70's to the mid- 90's across the nation. Since then it has become known that polybutylene deteriorates over time and leaks.