**2.3 Tensile strength**

In order to withstand the tension applied by winding machines during capacitor manufacturing, a polymer dielectric must have sufficient tensile strength. A typical value of tension used by capacitor manufacturers is about 10 MPa while the typical tensile strength for various commercially available capacitor films is in the range of 160–200 MPa [41]. In comparison, Kapton® polyimide has a tensile strength of 72 MPa and poly(ether imide) 97 MPa [31]. Based on these values, the tensile strengths of the polymers discussed herein are sufficient for capacitor winding.
