PU, is abbreviation of Thermoplastic Polyurethane. It is usually used as the cable jacket due to its excellent dielectric constant. As its name implies, TPU curly cord means Polyurethane TPU jacketed curly cord.
TPU curly cord has the equally electricity properties as PVC cord among the many different types of jacketed cords. Detailed comparison refers to table 1-1 as following.
| Type | TPU curly cord | PVC cord | TPE cord | FRPE cord | FEP cord |
| Dielectric Constant | 4.00 ~ 8.00 | 4.00 ~ 8.00 | 1.30 ~ 2.30 | 2.20 ~ 2.40 | 2.10 |
Between TPU curly cord and pvc cord, there are outstanding features of using TPU curly cord. Detailed comparison refers to table 1-2 as following.
| Type | Density | Halogen free or not |
| TPU curly cord | 1.30 | Yes |
| PVC cord | 1.50 | No |