The Busch VM 068 and VM 100 are high-performance mineral oils specifically formulated for the lubrication of Busch R5 rotary vane vacuum pumps. Choosing the correct lubricant is not merely a maintenance task; it is the most critical factor in ensuring the longevity, efficiency, and ultimate vacuum pressure of your equipment. These "VM" (Vacuum Mineral) oils are engineered to meet the precise tolerances and thermal requirements of Busch engineering.
While both oils share a high-purity mineral base, they are distinguished by their kinematic viscosity, tailored to different pump sizes and operating temperatures:
Viscosity Grades: VM 100 (ISO VG 100) is the standard for most mid-to-large R5 pumps (e.g., RA 0063 to RA 0630), while VM 068 (ISO VG 68) is typically used in smaller units or cooler environments to ensure easier cold starts.
Flash Point: High thermal stability with a flash point exceeding 230°C, preventing premature oil breakdown under heavy loads.
Vapor Pressure: Extremely low volatility, which is essential for reaching an ultimate pressure of 0.1 hPa without oil molecules contaminating the vacuum chamber.
Water Separation: Excellent demulsifying properties that allow the oil to separate quickly from moisture—a vital feature for food packaging applications involving steam or humidity.
Using genuine Busch VM oil provides a multi-layered defense for your vacuum system. Firstly, it provides superior sealing between the rotary vanes and the cylinder wall. This tight seal is what allows the pump to maintain its maximum pumping speed and achieve deep vacuum levels consistently.
Secondly, these oils are enriched with specia lized anti-wear and anti-corrosion additives. These protect the precision-ground internal surfaces from the corrosive effects of process gases and moisture, significantly extending the time between overhauls. The high resistance to oxidation prevents the formation of "sludge" or carbon deposits, which are the leading causes of filter clogging and motor strain. By maintaining a clean internal environment, VM 068 and VM 100 ensure that the integrated oil separators function at 99.9% efficiency, keeping the exhaust air clean and the production floor hygienic.
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