ISO VG 220 vs ISO VG 320 Gear Oil
ISO VG 220 and ISO VG 320 are two common viscosity grades in industrial gearboxes. The main difference between them is viscosity; however, which grade to use depends on the gear geometry, speed, load, temperature, and OEM design.
What does the difference in viscosity provide?
VG 320 has a higher viscosity than VG 220. Higher viscosity can provide a thicker oil film under certain heavy load and low-speed conditions; however, it can create disadvantages in terms of friction losses and flow at low temperatures.
Gear speed and load relationship
In general, low speed and high load conditions may lead to a need for higher viscosity. At high speeds, however, excessively viscous oil can cause a temperature increase and energy loss. Therefore, selecting a class based solely on load information is not correct.
The difference between Mineral, PAO and PAG
Mineral, PAO, or PAG-based products can be found within the same ISO VG class. Base oil technology has a significant impact on viscosity index, friction behavior, oxidation life, seal compatibility, and miscibility.
Why is OEM advice crucial?
The gearbox manufacturer's oil specification, ambient temperature range, and service factor must be considered. Incorrect viscosity can lead to problems such as insufficient film or unnecessary power loss.
Conclusion
When choosing between VG 220 and VG 320, instead of adopting a 'higher viscosity is better' approach, gearbox design, operating temperature, speed, and load should be evaluated together.
For product selection, application evaluation, and technical support, you can contact GataMerk Industrial via info@gatamerk.com.
Get Technical Support for Your Application
Share information about your equipment, process conditions, and current lubricant; let the GataMerk technical team evaluate suitable product and application options.
Comments