Polyurethane was produced for the first time in Germany in 1937. Polyurethane is a thermosetting polymer.  TPU- Thermoplastic polyurethane came later. Thermoplastic polyurethane (TPU) was invented by Lubrizol Engineered Polymers in 1959, while the company was still called BF Goodrich. Since TPU's invention, Lubrizol has continued to innovate the material, creating the first Non-Halogenated Flame Retardant TPU and the first Static Dissipative TPU.¹
TPU is used in outomotive cables, trailer cables , and special applications of power cables.  It has many advantages.  TPU has excellent resistance to oils, solvents, greases and gasoline. Polyurethane has excellent electrical insulating properties and used successfully in many wire and cable harness assemblies in automotive industry, and household appliances.  It has outstanding resistance to oxygen, ozone, sunlight and general weather conditions as well. TPU is shown as "11Y" either it is used as core insulation or jacketing for VDE types- as in 11YS11Y . In harmonised coding TPU is shown as "Q"  as in H07BQ-F.

 Keep in mind that TPU granule has to be pre-heated (dried ) before extrusion.  Temperature settings of extruder must be precise.  Temperature of entrance and exit should be level.