According to research and practice, adding artificial graphite with an ash content of not more than 1% in the electrode paste can increase the electrical conductivity, thermal conductivity and thermal stability of the product.
Hard graphite has the characteristic of being easy to adhere to hard surfaces. This characteristic is like liquid wetting on a solid surface to form a thin film. At the same time, it has a relatively large adsorption force for asphalt. This has its practical significance for use.