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ASTM D4684-12

Standard Test Method for Determination of Yield Stress and Apparent Viscosity of Engine Oils at Low Temperature
standard by ASTM International, 12/01/2012
Publisher: ASTM

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Description

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 and -40°C. The precision is stated for test temperatures from -40 to -15°C. The viscosity measurements are made at a shear stress of 525 Pa over a shear rate of 0.4 to 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.

Product Details

Published:: 12/01/2012
Number of Pages:: 14
File Size:: 1 file , 150 KB
Redline File Size:: 2 files , 300 KB

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