Distinctive Features of Vacuum Oil
• High heat resistance
• No change in color
• No change in shape
• No change in odor
Roles of Oil in Vacuum Pumps
Oil in vacuum pumps is used as a lubricant to reduce friction and wear of moving parts, and also for sealing and protecting the pump against moisture and other contaminants.
The presence of oil also helps transfer heat from the pump, maintain vacuum, and prevent air leakage into the system. The type of oil used in a vacuum pump depends on the pump type and its application, but typically mineral oils and synthetic oils are used.
Oil plays various roles in vacuum pumps, including:
Acting as a filler for empty spaces and sealing system (to prevent air from entering the clearance between pump parts and to enable proper vacuum generation).
Oil can be effective in creating suction close to absolute zero, since the vapor pressure of oil is much higher than that of water (provided that standard vacuum pump oil is used).
It serves as a lubricant and prevents wear of different components (Molish oil has very high viscosity and adhesiveness, which completely coats the surface of the rotor and vanes in the vacuum pump and protects them from environmental factors).
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| Test Title | Unit | Test Method | Result |
|---|---|---|---|
| Appearance | – | Visual | Clear & Bright |
| Color | – | ASTM D-1500 | Max 1 |
| Density at 15°C | kg/m³ | ASTM D-4052 | 860–880 |
| Kinematic Viscosity at 100°C | mm²/s (cSt) | ASTM D-445 | 4.7–5.7 |
| Viscosity Index | – | ASTM D-2270 | Min 90 |
| Flash Point | °C | ASTM D-92 | Min 200 |
| Pour Point | °C | ASTM D-97 | Max -6 |
| Noack Volatility at 250°C | % wt | ASTM D-5800 | Max 15 |
| Test Title | Result |
|---|---|
| Density at 20°C (g/cm³), not more than | 890 |
| Refractive Index at 20°C | – |
| Kinematic Viscosity at 100°C (cSt) | 9.5 – 8.0 |
| Pour Point (°C), not higher than | -12 |
| Flash Point (°C), not lower than | 220 |
| Viscosity Index, minimum | 95 |
| Color | – |
| Color by LIHT, maximum | 1 |
| Color by ASTM, maximum | 1 |
| Color by Conditional Units of KHC, maximum | 0.03 |
| Mass Fraction of Sulfur (%), maximum | 0.03 |
| Acid Number (mg KOH per 1 g oil), minimum | 0.05 |
| Mass Fraction of Mechanical Impurities (%), maximum | 0.005 |
| Test Title | Result |
|---|---|
| Density at 20°C (g/cm³), not more than | 890 |
| Refractive Index at 20°C | – |
| Kinematic Viscosity at 100°C (cSt) | 9.5 – 8.0 |
| Pour Point (°C), not higher than | -12 |
| Flash Point (°C), not lower than | 220 |
| Viscosity Index, minimum | 95 |
| Color | – |
| Color by LIHT, maximum | 1 |
| Color by ASTM, maximum | 1 |
| Color by Conditional Units of KHC, maximum | 0.03 |
| Mass Fraction of Sulfur (%), maximum | 0.03 |
| Acid Number (mg KOH per 1g oil), minimum | 0.05 |
| Mass Fraction of Mechanical Impurities (%), maximum | 0.005 |
| Property | Method | Unit | Typical Value |
|---|---|---|---|
| Viscosity @ 40°C | ASTM D445 | mm²/s | ≈ 68 |
| Viscosity @ 100°C | ASTM D445 | mm²/s | ≈ 6.8 – 7.0 |
| Density @ 15°C | ASTM D1298 | kg/m³ | ≈ 850 – 870 |
| Flash Point (COC) | DIN ISO 2592 | °C | ≈ 210 – 220 |
| Pour Point | DIN ISO 3016 | °C | ≈ -30 / -33 |
| Refrigeration Oil Group | DIN 51503 | – | KAA, KC, KE |
| Neutralization Number (TAN) | DIN/ASTM | mgKOH/g | < 0.04 |
| Saponification Number | DIN/ASTM | mgKOH/g | < 0.08 |
| Refrigerant Stability | DIN 5193 | – | ≥ 96 |