The Heart of Vacuum Systems: Selection Logic and Application Scenarios of Dialysis Diffusion Pump Oil

In the field of vacuum technology, obtaining a pure and stable vacuum environment is fundamental to driving technological progress. As the "blood" of a diffusion pump, the choice of pump oil directly determines the performance ceiling of the vacuum system—it concerns not only the achievable vacuum level but also the cleanliness of the entire process environment.

Core Dimensions for Selection: Vacuum Quantity and Quality

Choosing pump oil for a vacuum system essentially involves balancing two core indicators:

Vacuum Level (Quantity): The saturated vapor pressure of the pump oil directly determines the ultimate vacuum the system can achieve.

Cleanliness (Quality): The thermal stability and chemical composition of the pump oil determine whether it will become a source of contamination, affecting the final product.

Different application scenarios place drastically different emphasis on these two indicators, thus creating a clear "selection map."

Precise Matching of Application Scenarios and Pump Oils

Common Coating and Heat Treatment

Requirement Characteristics: Cost-sensitive, moderate vacuum requirements.

Preferred Solution: High-quality mineral oil or ester oil. Achieves optimal economy while meeting basic performance requirements.

High-End Optical Coating and Vacuum Metallurgy

Requirement Characteristics: High vacuum requirements and long-term thermal stability.

Preferred option: Silicone oil (such as DC-704). It achieves a perfect balance between excellent saturated vapor pressure and thermal stability, making it a reliable and cost-effective mainstream choice.

Semiconductor Manufacturing and Cutting-Edge Scientific Research

Requirements: A pursuit of ultra-high vacuum and extremely high cleanliness; even trace amounts of silicon contamination can lead to chip or sample failure.

Essential Solution: Polyphenylene oxide (PPE). Its non-silicon-based nature fundamentally eliminates silicon contamination, while also possessing superior thermal stability and extremely low saturated vapor pressure, making it a "safety valve" for high-end semiconductors and surface analysis.

Space Environment Simulation

Requirements: The system is large-scale with long operating cycles, demanding pump oil with superior thermal stability and reliability.

Reliability Guarantee: High thermal stability silicone oil or polyphenylene ether. Both provide robust protection for long-term, stable extreme vacuum environments.

From routine process control to exploring the unknown frontiers of scientific research, the right diffusion pump oil is the cornerstone of stable and efficient operation of vacuum systems. It is not only the medium that generates vacuum, but also a key player in safeguarding process purity and determining the fate of products. Leveraging our profound understanding of the characteristics of a full range of pump oils, we are committed to providing you with complete solutions and professional selection support, from economical mineral oils to top-grade polyphenylene ethers, helping you match the most powerful "heart" to every vacuum system and jointly propelling "Made in China" to new heights.