ASTM D4741-00

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An American National Standard
Designation:D4741–00
Standard Test Method for
Measuring Viscosity at High Temperature and High Shear
1
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.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
1. Scope D4683 Test Method for MeasuringViscosity at High Shear
2
Rate and High Temperature by Tapered Bearing Simula-
1.1 Thistestmethod coversthelaboratorydeterminationof
4
6 –1
tor
the viscosity of oils at 150°C and 1 3 10 s and at 100°C and
5
6 –1
2.2 Coordinating European Council (CEC) Standard:
1 3 10 s , using high shear rate tapered-plug viscometer
L36-A90 The Measurement of Lubricant Dynamic Viscos-
models BE/C or BS/C.
ity under Conditions of High Shear (Ravenfield)
1.2 Newtonian calibration oils are used to adjust the work-
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2.3 Institute of Petroleum Standard:
ing gap and for calibration of the apparatus. These calibration
IP 370 Test Method for the Measurement of Lubricant
oils cover a range from approximately 1.8 to 5.9 mPa-s (cP) at
DynamicViscosityUnderConditionsofHighShearUsing
150°C and 4.2 to 18.9 mPa-s (cP) at 100°C. This test method
the Ravenfield Viscometer
should not be used for extrapolation to higher viscosities than
those of the Newtonian calibration oils used for calibration of
3. Terminology
the apparatus. If it is so used, the precision statement will no
3.1 Definitions:
longer apply.
3.1.1 apparent viscosity, n—the determined viscosity ob-
1.3 Anon-Newtonian reference oil is used to check that the
tained by this test method.
workingconditionsarecorrect.Theexactviscosityappropriate
3.1.2 density, n—the mass per unit volume. In the SI, the
to each batch of this oil is established by testing on a number
3
unitofdensityisthekg/m ,butforpracticaluse,asubmultiple
of instruments in different laboratories. The agreed value for
3 –3 3
ismoreconvenient.Theg/cm is10 kg/m andiscustomarily
this reference oil may be obtained from the chairman of the
used.
Coordinating European Council (CEC) Surveillance Group for
3.1.3 kinematic viscosity, n—theratiooftheviscositytothe
CEC L-36-A90, or from the distributor.
density of a liquid. It is a measure of the resistance of flow of
1.4 Applicability to products other than engine oils has not
aliquidundergravity.IntheSI,theunitofkinematicviscosity
been determined in preparing this test method.
isthemetresquaredpersecond;forpracticaluse,asubmultiple
1.5 Thistestmethodusesthemillipascalseconds,mPa-s,as
(millimetre squared per second) is more convenient. The
the unit of viscosity. For information, the equivalent cgs unit,
2
centistoke (cSt) is 1 mm /s and is often used.
centipoise, cP, is shown in parentheses.
3.1.4 Newtonian oil or fluid, n—an oil or fluid, which at a
1.6 This standard does not purport to address all of the
given temperature, exhibits a constant viscosity at all shear
safety concerns, if any, associated with its use. It is the
rates or shear stresses.
responsibility of the user of this standard to establish appro-
3.1.5 non-Newtonian oil or fluid, n—an oil or fluid that
priate safety and health practices and determine the applica-
exhibits a viscosity that varies with changing shear stress or
bility of regulatory limitations prior to use.
shear rate.
2. Referenced Documents 3.1.6 shear rate, n—the velocity gradient in fluid flow. The
−1
SI unit for shear rate is the reciprocal second (s ).
2.1 ASTM Standards:
3.1.7 shear stress, n—themotivatingforceperareaforfluid
D91 Test Method for Precipitation Number of Lubricating
3
flow. The area is the area of shear. In the SI, the unit for shear
Oils
stress is the Pascal (Pa).
3.1.8 viscosity, n—theratiobetweentheappliedshearstress
1
and rate of shear. It is sometimes called the coefficient of
This test method is under the jurisdiction of ASTM Committee D02 on
Petroleum Products and Lubricants and is the direct responsibility of Subcommittee
D02.07 on Flow Properties.
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Current edition approved Dec. 10, 2000. Published February 2001. Annual Book of ASTM Standards, Vol 05.02.
2 5
This test method is technically identical to that described in CEC L36–A90 AvailablefromCoordinationEuropeanCouncil,MadouPlaza,25thfloor,Place
(under the jurisdiction of the CEC Engine Lubricants Technical Committee) and in Madou 1, B-1030, Brussels, Belgium.
6
IP370. Available from Institute of Petroleum, 61 New Cavendish St., London WIM
3
Annual Book of ASTM Standards, Vol 05.01. 8AR, U.K.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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