Equivalent viscosities for 100☏ and 210☏ are shown.Saybolt Furol : Valid if more than 100, indicative 15 to 100. SAE 80 to 250 and 20 to 50 are specified at 100☌. centiStokes (CGS system), centiPoise, cSt, mm/s, cP.SAE 75W, 80W, 85W and 5W to 25W are specified at 100☌ and also at low temperatures.one stoke is equivalent to 100 centistokes (cSt), or 0.00107 ft2/sec. ISO and AGMA are specified at 40 degrees Celsius. TABLE 8.62d Viscosities of Different Materials in Different Units of Viscosity.Viscosities are based on VI 95 single grade oil.Viscosities can only be read horizontally.In the overview below, the various classifications can be compared to make the right choice. In addition to SAE Engine classification there is also the SAE Gear classification which relates to gear applications such as transmissions and differentials.ĪGMA classification is only used for industrial gear oils. The prescribed SAE classification is often described in the engine / vehicle manual. The first number refers to the low temperature viscosity class (W = winter, while the second number (40) refers to the high temperature viscosity class. A SAE 15W40 stands for multigrade and SAE 40 stands for a monograde. The SEA Engine classification is mainly used in the automotive industry and concerns a classification of engine oil. The difference is when the viscosity is tested at a much colder temperature. In other words, a SAE 30 motor oil is the same viscosity as a 10w-30 or 5W-30 at 210° (100° C). The prescribed ISO classification is described in the manual of the machine. SpectraSyn 100 Polyalphaolefin (PAO) Fluid Product Description SpectraSyn High Viscosity Polyalphaolefin (PAO) basestocks feature low temperature properties (pour point and viscosity), low volatility, and improved thermal stability. The numbers without the W are all tested at 210° F or 100° C which is considered an approximation of engine operating temperature. The values are expressed in cSt (centistokes). The reference temperature of 40 ° C is chosen because this temperature often occurs during operation. The ISO classification is used in machine construction. If the temperature rises, the liquid will become thinner, if the temperature drops, the liquid will become syrupier. Viscosity is highly dependent on the temperature. ![]() It is the property of a fluid that indicates the extent to which it offers resistance to shear stress deformation (force divided by the surface). ![]() Viscosity is a physical material property.
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