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This test method covers the measurement of the yield stress and viscosity of engine oils after cooling at controlled rates over a period exceeding 45âh to a final test temperature between -10âC 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 525âPa over a shear rate of 0.4âs-1 to 15âs-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.
The course can be completed in approximately one hour.
By the end of this course, you will be able to:
Anyone who runs the D4684 test method or who needs an understanding of the test method and how it is properly run.
Certificate: A certificate is available upon successful completion of the course and an 80% or higher score on the exam.
This training course is part of the following certificate program(s):
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