Gearboxes employed in industrial machinery are subject to intense pressures and high-heat environments. High-performance lubricants referred to as gear oils are required to be blended with certain additive systems in order to stand up to the harsh settings within which gearboxes are engaged. These fluids are designed to lubricate gear teeth and prevent metal-to-metal contact in moderately-loaded gearboxes. These gear lubes are not recommended for usage in gearboxes calling for an Extreme Pressure (EP) Gear Lube.
ISO VG 150 oil has a midpoint kinematic viscosity of 150 mm2/s, also referred to as centistokes (cSt). The midpoint is derived by taking the average of both the minimum and maximum kinematic viscosities. In the case of ISO VG 150 oil, those numbers are 135 cSt and 165 cSt, respectively. AGMA 4 lubricants have a minimum viscosity of 135 mPa.s and a maximum viscosity of 165 mPa.s. These numbers refer to the standard testing mechanisms used to determine how much resistance to flow (i.e. viscosity) these oils demonstrate.
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