What Is ISO VG 46 Hydraulic Oil?
ISO VG 46 is a viscosity class commonly used in industrial hydraulic systems. The '46' value indicates the kinematic viscosity class of the product at 40°C; it does not alone indicate the quality level or additive technology of the product.
What does ISO VG 46 mean?
The ISO VG classification groups industrial lubricants according to their kinematic viscosity at 40°C. Products in the ISO VG 46 class may be within the same viscosity range but may exhibit different performance in terms of wear prevention, oxidation stability, viscosity index, and material compatibility.
The difference between HLP and HV types
HLP type hydraulic oils focus on anti-wear and oxidation/corrosion protection performance. HV or HVLP products, on the other hand, can help maintain viscosity more stably over a wide range of temperature variations thanks to their higher viscosity index.
In which systems is it used?
ISO VG 46 is encountered in presses, machine tools, injection molding machines, non-mobile industrial hydraulic units, and various production equipment. The final choice should always be made according to the pump manufacturer, system pressure, and temperature conditions.
How to choose the right hydraulic oil?
Viscosity grade, OEM approvals, zinc content requirements, filterability, air separation, water separation, and seal compatibility should be evaluated. Direct mixing with a different product should not be done without knowing the chemical composition of the existing oil.
Conclusion
ISO VG 46 is a common viscosity grade, but the correct hydraulic oil selection is not based solely on the '46' rating. System design, temperature, pump type, and performance requirements must be considered together.
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