Pvc Tape for electrical insulation 5mil x 3/4 x 30, 0.13mm x 19mm x 10yds. Suitable for automotive wire harness wrapping Electrical tape (or insulating tape) is a type of pressure-sensitive tape used to insulate electrical wires and other materials that conduct electricity. It can be made of many plastics, but vinyl is most popular, as it stretches well and gives an effective and long lasting insulation.Today electrical tape is simply, "another form of insulation". The original electrical insulating tape was made of cloth tape impregnated with Chatterton's compound, an adhesive material manufactured using Gutta-percha. This type of tape was often used to insulate soldered splices on knob and tube wiring. It was commonly referred to as "friction tape", and had the unique property of being sticky on both sides. Because of this, no matter how it was used it stuck to itself very readily.Electrically insulating tapes are essential for enhancing functionality and reliability in a wide range of applications. Some of the most popular types include electrically insulating adhesive tape and electrically insulating film, both of which provide reliable electronic isolation and ensure that direct electrical connection is not made between two or more circuits or their adjacent parts.