Natural rubber manufacturers tell you the working mechanism of conductive rubber generally rubber is a good electrical insulator. There are two theories of conductive mechanism of compound conductive rubber, namely chain conductive path and tunnel effect. The mechanism of the chain conductive pathway is that the packed particles must be close to each other within a few tenths of a nanometer, so that the pressure difference can be generated, and the π electrons of the packed particles can realize the current through the chain transfer movement. The dispersion of filler particles in rubber to form a chain lock must have a certain amount of filler, in order to have a strong electrical conductivity phenomenon, so the main factor controlling the electrical conductivity of rubber is the amount of filler, this is a classic interpretation.

The chain type conductive path is established on the premise that the filler whisker forms a chain lock. However, when rubber is stretched under an electron microscope, there is no carbon black chain, but it still conducts electricity, which is the tunneling effect. When conductive particles do not contact each other, there is a polymer isolation layer between the particles, which hinders the directional movement of free electrons in conductive particles. This barrier can be regarded as a barrier with a certain potential energy. For a microscopic particle, if its energy is less than the energy of the barrier, it has the possibility of being bounced off, and it has the possibility of going through the barrier. The phenomenon of microscopic particles passing through the barrier is called penetration effect, also known as tunnel effect. As a microscopic particle, electrons have the possibility to pass through the barrier between conductive particles. This possibility depends on the thickness of the barrier and the difference between the energy of the barrier and the energy of the electron. The smaller the difference between the thickness and this value, the more likely the electrons are to pass through the barrier. When the thickness of the insulating layer is small to a certain value, electrons can easily pass through, so that the insulating layer between conductive particles becomes conductive layer. This conductive layer created by tunneling can be equivalent with a resistor and a capacitor in parallel. That is, the conductivity is determined by the tunneling of the filler particles. At the same time, experiments have proved that the volume resistance increases with the spacing of packing particles increasing.

In addition, there is also the mechanism of electric field radiation conduction, because when studying the voltage and current characteristics of polymer materials filled with filler, it is found that the results do not conform to Ohm's law. It is believed that this is due to the electric field intensity of high voltage between packing particles and the electric field emission caused by the electric current. To sum up, rubber manufacturers believe that no matter what kind of conductive mechanism is understood, they believe that the type and amount of filler is the main factor controlling the electrical conductivity of the material.