ASTM D4741-17

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it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: D4741 − 13 D4741 − 17
Standard Test Method for
Measuring Viscosity at High Temperature and High Shear
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Rate by Tapered-Plug Viscometer
This standard is issued under the fixed designation D4741; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the U.S. Department of Defense.
1. Scope*
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1.1 This test method covers the laboratory determination of the viscosity of oils at 150 °C and 1 × 10 s s and at 100 °C and
6 –1
1 × 10 s s , using high shear rate tapered-plug viscometer models BE/C or BS/C.
1.2 Newtonian calibration oils are used to adjust the working gap and for calibration of the apparatus. These calibration oils
cover a range from approximately 1.4 mPa·s to 5.9 mPa·s (cP) at 150 °C and 4.2 mPa·s to 18.9 mPa·s (cP) at 100 °C. This test
method should not be used for extrapolation to higher viscosities than those of the Newtonian calibration oils used for calibration
of the apparatus. If it is so used, the precision statement will no longer apply. The precision has only been determined for the
viscosity range 1.48 mPa·s to 5.07 mPa·s at 150 °C and from 4.9 mPa·s to 11.8 mPa·s at 100 °C for the materials listed in the
precision section.
1.3 A non-Newtonian reference oil is used to check that the working conditions are correct. The exact viscosity appropriate to
each batch of this oil is established by testing on a number of instruments in different laboratories. The agreed value for this
reference oil may be obtained from the chairman of the Coordinating European Council (CEC) Surveillance Group for CEC
L-36-A90,L-36-90, or from the distributor.
1.4 Applicability to products other than engine oils has not been determined in preparing this test method.
1.5 This test method uses the millipascal seconds, mPa·s, as the unit of viscosity. For information, the equivalent cgs unit,
centipoise, cP, is shown in parentheses.
1.6 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility
of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory
limitations prior to use.
2. Referenced Documents
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2.1 ASTM Standards:
D91 Test Method for Precipitation Number of Lubricating Oils
D4683 Test Method for Measuring Viscosity of New and Used Engine Oils at High Shear Rate and High Temperature by Tapered
Bearing Simulator Viscometer at 150 °C
D5481 Test Method for Measuring Apparent Viscosity at High-Temperature and High-Shear Rate by Multicell Capillary
Viscometer
D6300 Practice for Determination of Precision and Bias Data for Use in Test Methods for Petroleum Products and Lubricants
D6708 Practice for Statistical Assessment and Improvement of Expected Agreement Between Two Test Methods that Purport
to Measure the Same Property of a Material
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2.2 Coordinating European Council (CEC) Standard:
L36-A90CEC L-36-90 The Measurement of Lubricant Dynamic Viscosity under Conditions of High Shear (Ravenfield)
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This test method is under the jurisdiction of ASTM Committee D02 on Petroleum Products, Liquid Fuels, and Lubricants and is the direct responsibility of Subcommittee
D02.07 on Flow Properties.
Current edition approved Oct. 1, 2013Jan. 1, 2017. Published November 2013February 2017. Originally approved in 1987. Last previous edition approved in 20122013
as D4741 – 12.D4741 – 13. DOI: 10.1520/D4741-13.10.1520/D4741-17.
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This test method is technically identical to that described in CEC L36–A90L-36-90 (under the jurisdiction of the CEC Engine Lubricants Technical Committee) and in
IP 370.
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For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
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Available from CEC Secretariat, Interlynk Administrative Services, Ltd., Lynk House, 17 Peckleton Lane, Desford, Leicestershire, LE9 9JU, United Kingdom.Coor-
dinating European Council (CEC), Services provided by Kellen Europe, Avenue Jules Bordet 142 - 1140, Brussels, Belgium, http://www.cectests.org.
*A Summary of Changes section appears at the end of this standard
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