8/1/2023 0 Comments Hydraulic oil viscosity chart![]() ![]() A standard hydraulic oil will typically have a VI of around 100. Viscosity Index, or VI, is a number that indicates the viscosity stability of an oil vs temperature and is calculated from measurements at 40 C and 100 C. Oils get thinner as they get warmer and thicker when cold. Most OEM's specify suitable viscosity grades for their hardware and typical values might be ISO VG10 for a machine tool spindle, VG32 or 46 for most hydraulic systems, VG68 or 100 for warm running hydraulic systems. The International Standard ISO3448 defines specific viscosities in these terms, e.g. ![]() A measure of the thickness of the oil, viscosity can be expressed in a variety of units, but most standards today are based on centistoke units at 40 C. Having the right viscosity is crucial in all types of application. The actual values are likely to have been derived from the pump manufacturers' viscosity limits while considering the fluid required and environments conditions the equipment will be working under. ![]() These should include an optimum working range of probably around 40-55 C and then a maximum and minimum limit for intermittent operation, say for start-up and very hot days etc., of perhaps 5 C to 80 C. For maximum performance and reliability, it is vital that the fluid temperature remains within the system design, operating limits. Fluid temperature will significantly change its viscosity. ![]()
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