![]() The test is applied over the viscosity range of 500 to 900 000 mPa ![]() Only in the case of known Newtonian oils at the temperature desired is interpolation acceptable for the purpose of calibrating the spindle and glass cell (see Annex A1).ฤก.1 This test method covers the use of Brookfield viscometers of appropriate torque for the determination of the low-shear-rate viscosity of lubricants. Note 1-Low temperature viscosity values obtained by either interpolation or extrapolation of oils may be subject to errors caused by gelation and other forms of non-Newtonian response to spindle speed and torque. This test method describes how to measure apparent viscosity directly without the errors associated with earlier techniques using extrapolation of experimental viscometric data obtained at higher temperatures. This test method is used in a number of specifications. Measurement of the viscometric properties of these oils and fluids at low temperatures is often used to specify their acceptance for service. ![]() The low-temperature, low-shear-rate viscosity of automatic transmission fluids, gear oils, torque and tractor fluids, and industrial and automotive hydraulic oils (see Annex A4) are of considerable importance to the proper operation of many mechanical devices. ![]()
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