In the high-vacuum smelting industry, vacuum diffusion pump oil is the core medium that maintains the process environment throughout the entire smelting process. It can be regarded as the "invisible cornerstone" of industrial production. 
High-vacuum smelting is carried out in an ultra-high vacuum environment ranging from 10⁻³ to 10⁻⁶ Pa to prevent the metal melt from reacting with gases. The vacuum diffusion pump oil can efficiently remove residual gases in the furnace through a specific thermal cycling process. When the oil is heated to boiling point, it forms a directional steam flow, like an "invisible pump", carrying gas molecules to the exhaust port, stabilizing the vacuum level within the process requirements and providing the basic conditions for precision processes such as rare earth metal purification and special alloy smelting. 
In addition, it also plays a crucial supporting role. High-quality diffusion pump oil has extremely high chemical stability and is not prone to decomposition at working temperatures above 300℃, preventing the contamination of the metal melt by oil vapor and ensuring product purity. At the same time, its reasonable viscosity and vapor pressure characteristics can ensure the long-term stable operation of the diffusion pump, reducing the frequency of equipment shutdown and maintenance, and indirectly improving the operational efficiency of the smelting production line. 
In the smelting of key areas such as aerospace materials and high-end electronic components, the performance of vacuum diffusion pump oil directly affects product quality. Its presence enables high-vacuum smelting to move from theory to practical application, becoming an indispensable auxiliary material in modern high-end manufacturing.