ASTM D4684-17
- Standard Test Method for Determination of Yield Stress and Apparent Viscosity of Engine Oils at Low Temperature
- standard by ASTM International, 05/01/2017
- Category: ASTM
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1.1 This test method covers the measurement of the yield stress and viscosity of engine oils after cooling at controlled rates over a period exceeding 45 h to a final test temperature between -10 °C and -40 °C. The precision is stated for test temperatures from -40 °C to -15 °C. The viscosity measurements are made at a shear stress of 525 Pa over a shear rate of 0.4 s-1to 15 s-1. The viscosity as measured at this shear stress was found to produce the best correlation between the temperature at which the viscosity reached a critical value and borderline pumping failure temperature in engines.
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