The conductivity of special carbon black for wires and cables is one of its key characteristics in the application of wires and cables. Its conductivity can be measured from the following aspects.
First, resistivity is an important indicator to measure the conductivity of carbon black. The lower the resistivity, the better the conductivity of carbon black. Usually, a professional resistivity tester can be used to measure the resistivity of wire and cable materials containing carbon black. During the test, a wire and cable sample of a certain length and cross-sectional area is connected to the tester, and a certain voltage is applied to measure the current passing through the sample to calculate the resistivity. For special carbon black for wires and cables, it is generally hoped that it can reduce the resistivity of wires and cables to a lower level to meet the requirements of conductivity or antistatic.
Secondly, the conductivity of carbon black can be further evaluated by volume resistivity and surface resistivity. Volume resistivity reflects the conductivity of the material inside, while surface resistivity mainly measures the conductivity of the material surface. For wires and cables, both parameters are of great significance. For example, in some occasions where antistatic is required, a lower surface resistivity can effectively prevent the accumulation and discharge of static electricity. At the same time, volume resistivity will also affect the overall conductivity and signal transmission quality of wires and cables.
In addition, the structure and morphology of carbon black will also affect the conductivity. High-structure carbon black usually has a larger specific surface area and a more complex microstructure, which can form more conductive paths, thereby improving the conductivity. The conductivity of low-structure carbon black is relatively weak. The morphology and structure of carbon black can be observed by electron microscopy and other means to understand its effect on conductivity.
In practical applications, the conductive effect of carbon black can also be indirectly measured by testing the conductive properties of wires and cables. For example, the resistance, capacitance, inductance and other parameters of wires and cables can be measured, as well as the signal transmission performance at different frequencies. If the conductive properties of wires and cables are good, it means that the carbon black used in them has good conductive properties.
In addition, environmental factors will also have a certain impact on the conductive properties of carbon black. For example, changes in conditions such as temperature and humidity may cause changes in the conductive properties of carbon black. When measuring the conductive properties of carbon black, stability and reliability under different environmental conditions need to be considered.
In short, measuring the conductive properties of special carbon black for wires and cables requires comprehensive consideration of resistivity, volume resistivity, surface resistivity, carbon black structure, practical application tests, and environmental factors. Through scientific testing methods and evaluation indicators, the conductive properties of carbon black can be accurately understood, providing an important basis for the design and production of wires and cables.
