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ISO VG 100 | Hydraulic Oil | Cold Weather
Cold and freezing temperatures provide difficulties for efficient operations of hydraulic systems. Though hydraulic oils can commonly provide protection at varying temperatures, cold weather hydraulic oils are formulated to provide exceptional performance in very low temperatures as well as average and above-average operating temperatures. This increased performance is usually due to these oils' high Viscosity Indices (VI) and may sometimes be referred to as High-Viscosity Index Hydraulic Oil.
ISO VG 100 oil has a midpoint kinematic viscosity of 100 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 100 oil, those numbers are 90.0 cSt and 110.0 cSt, respectively. 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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