Polybutylene, also known as PB, has been mass-produced since 1964.
-	It is a thermoplastic polymer.
-	Applications: Used to make tubes, sheets, and profile extrusions by extrusion blow molding and/or injection molding.
-	General properties: It has high flexibility (even at low temperatures), a low embrittlement temperature, high toughness, high abrasion resistance, high resistance to chemical attack, and resistance to hot water and stress cracking. It has poor handling in the form of semi-finished goods and moldings after processing because of the start of crystal rearrangement.
-	Trade Name: Shell, Mitsui.