ISO viscosity classes – Standardized classification of industrial lubricants
ISO viscosity classes (according to ISO 3448) are an internationally standardized system for classifying industrial oils according to their kinematic viscosity at 40 °C. Unlike engine oil viscosities (e.g. SAE 5W-30), the focus here is not on flow properties at low and high temperatures, but on a precise classification of the lubricating film thickness under standard conditions.
What do ISO viscosity classes mean in practice?
In industrial applications – such as hydraulic oils, gear oils or turbine oils – the exact viscosity is crucial for the function of the system. ISO classes range from ISO VG 2 to ISO VG 1500 – each class (approximately) doubles the viscosity of the previous one.
Example:
ISO VG 32 = approx. 32 mm²/s at 40 °C
ISO VG 100 = approx. 100 mm²/s at 40 °C
This classification makes it easier to select comparable lubricants worldwide – regardless of manufacturer or region. BASINOL industrial lubricants are available in all common ISO classes.
Where are ISO viscosity classes used?
ISO classes are mainly used in the industrial sector, e.g. in hydraulic systems, compressors, industrial gearboxes or circulation systems. Unlike in the automotive sector, it is not SAE or API classes that count here, but the precise viscosity specification at 40 °C – standardized and valid worldwide.
How do I choose the right ISO class for my system?
This depends on the application, the operating temperature range and the recommendations of the equipment manufacturer. Low-viscosity oils (e.g. ISO VG 22 or 32) are ideal for precise control systems with small tolerances, while higher classes (e.g. ISO VG 220 or 460) are used for heavy gearboxes and high-load applications. BASINOL supports you with the right product selection for your specific industrial application.
What happens if I use the wrong viscosity grade?
An oil that is too thin can lead to an insufficient lubricating film and increased friction. If it is too thick, it may not be transported efficiently – which puts a strain on pumps, lines and seals. The correct ISO class ensures that the pe
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