High vacuum diffusion pump oil is a specialized fluid engineered to generate and maintain high and ultra-high vacuum environments in diffusion pump systems. Typically formulated from highly refined silicone oils or hydrocarbon fractions, this fluid possesses a distinct combination of low vapor pressure, high thermal stability, and excellent oxidation resistance. These properties are critical for preventing backstreaming and ensuring that the vacuum chamber remains free from contamination, which is essential for sensitive manufacturing and research processes. The fluid operates by being boiled to create a high-speed vapor jet that entrains gas molecules from the vacuum chamber and expels them through the exhaust.
The performance of diffusion pump oil is defined by its ability to withstand high operating temperatures without decomposing or forming sludge, which could compromise pump efficiency. Silicone-based diffusion pump oils, in particular, offer superior thermal stability and lower vapor pressure compared to hydrocarbon oils, allowing for the achievement of deeper vacuums. They also demonstrate excellent resistance to oxidation when exposed to air at elevated temperatures, reducing the frequency of oil changes and maintenance downtime. The fluid’s viscosity and boiling point are carefully balanced to ensure efficient pumping speed and stable operation across a wide range of vacuum levels.
High vacuum diffusion pump oil is extensively used in industries such as semiconductor manufacturing, optical coating, metallurgy, and scientific research. It is essential for processes like physical vapor deposition (PVD), chemical vapor deposition (CVD), vacuum furnaces, and electron microscopy. For laboratories and industrial facilities relying on high-vacuum technology, the choice of diffusion pump oil directly impacts the quality of the vacuum and the purity of the final product. This fluid provides a reliable and efficient solution for achieving the stringent vacuum requirements necessary for advanced technological applications.
General Precipitated Liquid Silicone, plz check
MY LSR 3525 Series 
