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ASTM D5621-01

(Test Method)

Standard Test Method for Sonic Shear Stability of Hydraulic Fluid

Standard Test Method for Sonic Shear Stability of Hydraulic Fluid

SIGNIFICANCE AND USE
This test method was developed using Test Method D 2603 – 91.
This test method permits the evaluation of shear stability with minimum interference from thermal and oxidative factors that may be present in some applications. It has been found applicable to fluids containing both readily sheared and shear-resistant polymers. Correlation with performance in the case of hydraulic applications has been established.
SCOPE
1.1 This test method covers the evaluation of the shear stability of a hydraulic fluid in terms of the final viscosity that results from irradiating a sample of the hydraulic fluid in a sonic oscillator.  
1.2 Evidence has been presented that a good correlation exists between the shear degradation that results from sonic oscillation and that obtained in a vane pump test procedure.  
1.3  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.  
1.4 This test method uses millimetres squared per second (mm ²/s), an SI unit, as the unit of viscosity. For information, the equivalent unit, cSt, is shown in parentheses.

General Information

Status
Historical
Publication Date
09-Aug-2001
ICS
75.120 - Hydraulic fluids
Technical Committee
D02 - Petroleum Products, Liquid Fuels, and Lubricants
Drafting Committee
D02.07 - Flow Properties
Current Stage
Ref Project

Relations

Replaces
ASTM D5621-94 - Standard Test Method for Sonic Shear Stability of Hydraulic Fluid
Effective Date
10-Aug-2001
Replaced By
ASTM D5621-07 - Standard Test Method for Sonic Shear Stability of Hydraulic Fluids
Effective Date
01-Dec-2007
Referred By
ASTM D6080-18a - Standard Practice for Defining the Viscosity Characteristics of Hydraulic Fluids
Effective Date
10-Aug-2001
Referred By
ASTM D6022-19 - Standard Practice for Calculation of Permanent Shear Stability Index
Effective Date
10-Aug-2001

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ASTM D5621-01 - Standard Test Method for Sonic Shear Stability of Hydraulic FluidASTM D5621-01 - Standard Test Method for Sonic Shear Stability of Hydraulic Fluid
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ASTM D5621-01 - Standard Test Method for Sonic Shear Stability of Hydraulic Fluid
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
An American National Standard
Designation:D5621–01
Standard Test Method for
1
Sonic Shear Stability of Hydraulic Fluids
This standard is issued under the fixed designation D 5621; 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 (e) indicates an editorial change since the last revision or reapproval.
1. Scope containing a readily sheared polymer is run frequently to
ensure that the equipment imparts a controlled amount of sonic
1.1 This test method covers the evaluation of the shear
energy to the sample.
stability of hydraulic fluids in terms of the final viscosity that
3.2 The conditions to obtain the data for the precision
results from irradiating a sample of the hydraulic fluid in a
statement were: 30 mL sample, 12.5 min calibration, and 40
sonic oscillator.
min sample irradiation at 0°C jacket temperature.
1.2 Evidence has been presented that a good correlation
exists between the shear degradation that results from sonic
4. Significance and Use
2
oscillation and that obtained in a vane pump test procedure.
4.1 This test method was developed using Test Method
1.3 This standard does not purport to address all of the
D 2603 – 91.
safety concerns, if any, associated with its use. It is the
4.2 Thistestmethodpermitstheevaluationofshearstability
responsibility of the user of this standard to establish appro-
with minimum interference from thermal and oxidative factors
priate safety and health practices and determine the applica-
that may be present in some applications. It has been found
bility of regulatory limitations prior to use.
applicable to fluids containing both readily sheared and shear-
1.4 This test method uses millimetres squared per second
2
resistant polymers. Correlation with performance in the case of
(mm /s), an SI unit, as the unit of viscosity. For information,
hydraulic applications has been established.
the equivalent unit, cSt, is shown in parentheses.
5. Apparatus
2. Referenced Documents
5.1 Sonic Shear Unit, fixed frequency oscillator and sonic
2.1 ASTM Standards:
5
horn.
D 445 Test Method for Kinematic Viscosity of Transparent
5.2 Auxiliary Equipment—To facilitate uniform perfor-
and Opaque Liquids (the Calculation of Dynamic Viscos-
3 mance, the following auxiliary equipment is recommended:
ity)
5.2.1 Cooling Bath or Ice Bath, to maintain a jacket
D 2603 Test Method for Sonic Shear Stability of Polymer-
4 temperature of 0°C.
Containing Oils
5.2.2 Griffın 50–mL Beaker, borosilicate glass.
3. Summary of Test Method 5.2.3 Sonic-Insulated Box, to enclose the sonic horn to
reduce the ambient noise level produced by the sonic shear
3.1 Aconvenient volume of hydraulic fluid is irradiated in a
unit.
sonic oscillator for a period of time and the change in viscosity
5.3 Viscometer, any viscometer and bath meeting the re-
isdeterminedbyTestMethodD 445.Astandardreferencefluid
quirements of Test Method D 445.
6. Reference Fluids
6
1
This test method is under the jurisdiction of ASTM Committee D02 on 6.1 The reference fluid is ASTM Reference Fluid B, a
Petroleum Products and Lubricants and is the direct responsibility of Subcommittee
petroleum oil containing a polymer capable of being broken
D02.07 on Flow Properties.
down by turbulence at high rates of shear. This oil has a
Current edition approved Aug. 10, 2001. Published September 2001. Originally
published as D 5621-94. Last previous edition D 5621-94.
2
Stambaugh, R. L., Kopko, R. J., and Roland, T. F., “Hydraulic Pump
5
Performance—A Basis for Fluid Viscosity Classification”, SAE Paper No. 901633. In the round robin program, equipment from Sonic Systems, Inc., 109 Pheasant
Available from Society ofAutomotive Engineers, 400 Commonwealth Dr., Warren- Run, Newtown, PA 18040 and Heat Systems Ultrasonic, Inc., 1938 New Highway,
dale, PA 15096. Farmingdale, NY 11735, were found to be satisfactory.
3 6
Annual Book of ASTM Standards, Vol 05.01. ThisfluidcanbeobtainedfromRohMaxUSA,723ElectronicDrive,Horsham,
4
Annual Book of ASTM Standards, Vol 05.02. PA 19044–2228.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1

---------------------- Page: 1 ----------------------
D5621–01
2
viscosity of about 13.6 mm /s (cSt) at 40°C. The viscosity of a
specific lot is supplied by the provider of that lot.
7. Calibration of Apparatus
7.1 The reference fluid provides a practical way to define
the performance (severity level) of a sonic oscillator unit so
that satisfactory comparison can be made between tests run on
different days in the same unit and between tests run with
different units.
7.2 The decrease in viscosity observed for a given hydraulic
fluidonirradiationin
...

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