ASTM D4684 Standard Test Method for Determination of Yield Stress and Apparent Viscosity of Engine Oils at Low Temperature-- eLearning Course

accredited iacet provider
Price: $174
About the Course

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-1 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.

The course takes approximately 1 hour to complete and includes instructional video content, interactive knowledge checks, and a self-grading quiz. Downloadable resources include a pdf of the standard.

Learning Outcomes

By the end of this course, you will be able to:

  • Identify apparatus and related components used in determination of yield stress and apparent viscosity of engine oils at low temperature, including temperature measuring device requirements
  • Recognize reagents and materials used in this test method, including low cloud-point Newtonian oil
  • Recognize sampling requirements as outlined in ASTM D4684
  • Recall calibration and standardization requirements for Procedure A
  • Recall yield stress and viscosity measurement requirements for Procedure A, including cell preparation and measurement of both yield stress and apparent viscosity
  • Identify calculation procedures for yield stress and apparent viscosity as outlined in Procedure A
  • Recognize reporting procedures for yield stress and apparent viscosity as outlined for Procedure A


Anyone who runs the D4684 test method or who needs an understanding of the test method and how it is properly run.

Certificate and CEUs

CEUs: .1

Certificate: A certificate is available upon successful completion of the course and an 80% or higher score on the exam.

ASTM Standards Referenced

ASTM D4684

Related Products

This training course is part of the following eLearning program(s):


1 year online subscription for a Single-User Only via username/password. Requires internet access.

For pricing for Multi-User access or for more information, please contact sales here or call 1-877-909-ASTM.

Stock #