In the field of high vacuum acquisition technology, the diffusion pump oil serves as the core working medium of the vacuum system, and its performance directly determines the vacuum level that the system can achieve, the pumping rate, and the operational stability. With the wide application of vacuum technology in semiconductor manufacturing, optical coating, material processing, and scientific research experiments in China, the demand for diffusion pump oil with low saturated vapor pressure, good thermal stability, and moderate viscosity continues to grow. Anhui Aiyouta Silicone Oil Co., Ltd. has launched the product "High Vacuum Diffusion Pump Oil 704" (domestic brand 274), which, with its reliable ultimate vacuum level, stable physical and chemical properties, and diverse packaging specifications, provides high-quality oil options for various industries' medium and high vacuum applications.


I. Core Physical and Chemical Characteristics of the Product


Product High Vacuum Diffusion Pump Oil 704 is a colorless transparent liquid. At 25 degrees Celsius, its kinematic viscosity is 38 plus or minus 3 centistokes. Its refractive index is between 1.5500 and 1.6500, and its relative density is between 0.06 and 0.07. The flash point of this product is not lower than 210 degrees Celsius, and its freezing point is not higher than -35 degrees Celsius.


This product demonstrates outstanding performance in vacuum properties. Its ultimate vacuum level can reach an excellent level of less than 1 times 10 to the power of -7 torr to 10 to the power of -8 torr, and its saturated vapor pressure is lower than 2 times 10 to the power of -8 torr. This extremely low vapor pressure characteristic ensures that the volatile molecules of the oil itself contribute very little to the system's vacuum level under high vacuum conditions, effectively inhibiting the risk of reverse diffusion of oil vapor to the vacuum chamber and the surface of the workpiece. Its flash point of not less than 210 degrees Celsius and good thermal stability enable the oil to maintain chemical inertness during heating evaporation and high-speed jetting operations, resisting thermal oxidation degradation, and extending the oil's service life. The freezing point of -35 degrees Celsius ensures the normal storage and startup performance of the product in cold environments.


II. Wide Application Areas


Product High Vacuum Diffusion Pump Oil 704, with its reliable vacuum performance and stable physical and chemical properties, can play a key role in multiple medium and high vacuum application areas, specifically including:


1. High Vacuum Smelting Industry. In vacuum induction melting, vacuum degassing, and vacuum heat treatment processes, Product High Vacuum Diffusion Pump Oil 704 can provide a stable high vacuum environment for melting furnaces and heat treatment furnaces, effectively removing gases and impurities from the metal melt, improving the purity and metallurgical quality of high-temperature alloys, precision alloys, and special steel. Its low return oil rate reduces the contamination of oil vapor on the metal surface, ensuring the surface quality of the product.


2. Electronic Tube and Vacuum Device Manufacturing. Product High Vacuum Diffusion Pump Oil 704 is widely used in the exhaust and encapsulation processes of vacuum electronic devices such as receiving amplification tubes, emission tubes, microwave tubes, and X-ray tubes. In the manufacturing process of these devices, high vacuum is the basic condition for ensuring the stability of device electrical parameters and service life. The excellent oxidation resistance and chemical stability of this product ensure stable vacuum performance during repeated high-temperature baking and exhaust processes, meeting the batch production quality requirements of electronic tube manufacturing.


3. Lamp and Lighting Device Manufacturing. On production lines of various special lamps, automotive lamps, projection lamps, and energy-saving lamps, Product High Vacuum Diffusion Pump Oil 704 can be used in the high vacuum acquisition of the exhaust system to effectively remove harmful gases and moisture from the lamp inside, extending the filament life, and improving the light efficiency and color temperature stability of the lamp.


4. High Vacuum Coating and Film Preparation. In optical coating, decorative coating, and functional film vacuum evaporation and magnetic control sputtering processes, Product High Vacuum Diffusion Pump Oil 704 can maintain a stable high vacuum level in the coating chamber, ensuring the purity and adhesion of the film layer. Its lower oil vapor pressure reduces the adverse impact of organic pollutants on the quality of the film layer, helping to improve the coating quality of optical lenses, automotive lamps, and mobile phone screens, etc.


VII. Atomic Energy Accelerator and Nuclear Physics Experiment Auxiliary System. In the injection and extraction systems of particle accelerators, the target chamber, and diagnostic equipment, the product high vacuum diffusion pump oil 704 can provide a reliable high vacuum environment, reducing the collision and scattering of beam and residual gas molecules, and ensuring the accuracy of experimental data and the operation efficiency of the accelerator.


VIII. Electron Microscope and Surface Analysis Instruments. Analytical instruments such as scanning electron microscopes, electron probes, and Auger electron spectroscopy instruments have high requirements for vacuum. The product high vacuum diffusion pump oil 704 can provide a clean and stable high vacuum environment for these instruments, ensuring high-resolution imaging and surface composition analysis accuracy, and suitable for routine scientific research detection and teaching laboratory applications.


IX. Display Manufacturing and Vacuum Coating Process. In the preparation of reflective films for liquid crystal display backlight modules, electrode evaporation for OLED devices, and the manufacturing of plasma display panels, the product high vacuum diffusion pump oil 704 can meet the requirements of high vacuum in the process, helping to improve the luminous efficiency and display uniformity of display devices.


X. Vacuum Freezing Drying and Food Packaging. In vacuum freezing drying equipment in the pharmaceutical and food industries, the product high vacuum diffusion pump oil 704 can provide a stable high vacuum environment for the drying chamber, accelerating the sublimation and removal of moisture, and maintaining the biological activity and nutritional components of the materials. At the same time, in vacuum packaging machinery, it is used for vacuum maintenance in the exhaust system, extending the shelf life of packaged food.


III. Packaging Specifications and Storage Conditions


The product high vacuum diffusion pump oil 704 is available in various packaging specifications such as one-kilogram plastic bottles, five-kilogram, twenty-five-kilogram, fifty-kilogram plastic drums, and two-hundred-kilogram iron drums, facilitating flexible selection by different-sized laboratories, research institutions, and production enterprises. The finished product should be stored in a damp-proof, moisture-proof, and protected from direct sunlight warehouse, with an indoor temperature range of minus forty to fifty degrees Celsius. The finished product should be transported and stored as non-hazardous goods, and during transportation, it should avoid severe impacts and packaging damage, keeping the container sealed to prevent external pollutants from entering. If unopened and meeting storage conditions, the shelf life of this product is three years.


IV. Quality Assurance and Application Positioning


The product high vacuum diffusion pump oil 704 has established a strict quality control system during the production process, conducting full-process detection of key indicators such as appearance, viscosity, refractive index, relative density, flash point, freezing point, ultimate vacuum degree, and saturated vapor pressure to ensure consistency and reliability between batches. As a supplementary model of the product ultra-high vacuum diffusion pump oil 705, product 704 is positioned for medium-high vacuum applications, with a moderate viscosity and reliable vacuum performance, meeting the needs of a wider range of industrial production and scientific research experiments.


With the continuous expansion of the application fields of vacuum technology and the continuous upgrading of high-end manufacturing industries in China, the demand for stable quality and cost-effective domestic high vacuum oil products will continue to grow. The product high vacuum diffusion pump oil 704, with its mature process quality and wide application adaptability, is providing reliable oil product guarantees for many domestic vacuum application industries, helping these industries improve efficiency and quality.