High vacuum diffusion pump oil is a specialized lubricant used in high or ultra-high vacuum environments, and it also serves as an essential working medium for diffusion pumps. The following is a detailed explanation of high vacuum diffusion pump oil:

I. Definition and Working Principle
High vacuum diffusion pump oil is a mineral oil or silicone oil with a very low saturated vapor pressure at room temperature. After being heated and evaporated, it forms vapor that passes through a guide tube and nozzle to create a high-speed vapor jet. This vapor jet, as the working medium, relies on diffusion and entrainment to complete the pumping process, thereby providing a high or ultra-high vacuum environment.

II. Performance Characteristics
Low Saturated Vapor Pressure: It has an extremely low vapor pressure at room temperature, which helps to achieve high vacuum levels.
Good Thermal Stability: It is resistant to high temperatures and is not easily oxidized under the frequently high working temperatures and in the presence of metal catalysts.
Excellent Oxidation Stability: It is not easily oxidized when exposed to the atmosphere, extending its service life.
High Pumping Speed: It can efficiently extract gases, improving the vacuum level.

III. Application Fields
High vacuum diffusion pump oil is widely used in fields that require high vacuum environments, such as scientific research laboratories, the electronics industry, the chemical industry, medical equipment, and aerospace technology. In these fields, a high vacuum environment is crucial for the accuracy of experiments, product quality, and equipment performance.

IV. Precautions
When using high vacuum diffusion pump oil, it is necessary to select the appropriate grade to meet different vacuum requirements and to regularly replace and inspect the oil quality to ensure the normal operation and long-term stable performance of the diffusion pump.

In summary, high vacuum diffusion pump oil is an important lubricant and working medium that plays a key role in multiple fields.

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