Coal tar pitch is a special pitch material with excellent high-temperature stability and weather resistance. It is usually produced through specific production processes and formula adjustments, enabling the pitch to maintain a low viscosity at higher temperatures, thereby meeting engineering requirements. The physical properties of high-temperature pitch, such as viscosity and softening point, are very important parameters. For example, the viscosity of high-temperature pitch is generally no more than 40 mm2/s, ensuring that it can remain in a flowing state at high temperatures and is suitable for sealing and lubrication in high-temperature environments. In addition, the softening point of high-temperature pitch is 95 - 120℃, indicating that it can still maintain good viscosity and stability under high-temperature conditions.