ASTM D5621-07(2013)
(Test Method)Standard Test Method for Sonic Shear Stability of Hydraulic Fluids
Standard Test Method for Sonic Shear Stability of Hydraulic Fluids
SIGNIFICANCE AND USE
4.1 This test method was developed using Test Method D2603–91.
4.2 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 hydraulic fluids 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.2
1.3 This test method uses millimetres squared per second (mm2/s), an SI unit, as the unit of viscosity. For information, the equivalent unit, cSt, is shown in parentheses.
1.4 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.
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Designation: D5621 − 07 (Reapproved 2013)
Standard Test Method for
Sonic Shear Stability of Hydraulic Fluids
This standard is issued under the fixed designation D5621; 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.
1. Scope and after irradiation are determined by Test Method D445.A
standardreferencefluidcontainingareadilyshearedpolymeris
1.1 This test method covers the evaluation of the shear
run frequently to ensure that the equipment imparts a con-
stability of hydraulic fluids in terms of the final viscosity that
trolled amount of sonic energy to the sample.
results from irradiating a sample of the hydraulic fluid in a
sonic oscillator. 3.2 The conditions to obtain the data for the precision
statement were: 30 mL sample, 12.5 min calibration, and 40
1.2 Evidence has been presented that a good correlation
min sample irradiation at 0°C jacket temperature.
exists between the shear degradation that results from sonic
oscillation and that obtained in a vane pump test procedure.
4. Significance and Use
1.3 This test method uses millimetres squared per second
4.1 This test method was developed using Test Method
(mm /s), an SI unit, as the unit of viscosity. For information,
D2603–91.
the equivalent unit, cSt, is shown in parentheses.
4.2 Thistestmethodpermitstheevaluationofshearstability
1.4 This standard does not purport to address all of the
with minimum interference from thermal and oxidative factors
safety concerns, if any, associated with its use. It is the
that may be present in some applications. It has been found
responsibility of the user of this standard to establish appro-
applicable to fluids containing both readily sheared and shear-
priate safety and health practices and determine the applica-
resistant polymers. Correlation with performance in the case of
bility of regulatory limitations prior to use.
hydraulic applications has been established.
2. Referenced Documents
5. Apparatus
2.1 ASTM Standards:
5.1 Sonic Shear Unit, fixed frequency oscillator and sonic
D445 Test Method for Kinematic Viscosity of Transparent
horn.
and Opaque Liquids (and Calculation of Dynamic Viscos-
5.2 Auxiliary Equipment—To facilitate uniform
ity)
performance, the following auxiliary equipment is recom-
D2603 Test Method for Sonic Shear Stability of Polymer-
mended:
Containing Oils
5.2.1 Cooling Bath or Ice Bath, to maintain a jacket
D6022 Practice for Calculation of Permanent Shear Stability
temperature of 0°C.
Index
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 viscosities before
5.3 Viscometer, any viscometer and bath meeting the re-
quirements of Test Method D445.
This test method is under the jurisdiction of ASTM Committee D02 on
Petroleum Products, Liquid Fuels, and Lubricants and is the direct responsibility of
6. Reference Fluids
Subcommittee D02.07 on Flow Properties.
Current edition approved Oct. 1, 2013. Published October 2013. Originally
6.1 The reference fluid is ASTM Reference Fluid B, a
approved in 1994. Last previous edition approved in 2007 as D5621 – 07. DOI:
petroleum oil containing a polymer capable of being broken
10.1520/D5621-07R13.
2 down by turbulence at high rates of shear. This oil has a
Stambaugh, R. L., Kopko, R. J., and Roland, T. F., “Hydraulic Pump
Performance—A Basis for Fluid Viscosity Classification”, SAE Paper No. 901633.
Available from Society of Automotive Engineers, 400 Commonwealth Dr.,
Warrendale, PA 15096. The sole source of supply of the fluid known to the committee at this time is
For referenced ASTM standards, visit the ASTM website, www.astm.org, or Evonik OilAdditives USA, 723 Electronic Drive, Horsham, PA19044–2228. If you
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM are aware of alternative suppliers, please provide this information to ASTM
Standards volume information, refer to the standard’s Document Summary page on International Headquarters. Your comments will receive careful consideration at a
the ASTM website. meeting of the responsible technical committee, which you may attend.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
D5621 − 07 (2013)
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
fluidonirradiationinanoscillatorunitdependsonanumberof
factors; these include sample volume, irradiation time, and
oscillator power setting. Frequency of the generator is 23 6 2
kHz. Typical power settings are in the range of 50 watts.
Manual tuning of the oscillator-horn combination is also
required in some instruments in order to ensure efficiency of
energy coupling between the two units. The procedure de-
scribed in 7.3 is recommended for establishing a reproducible
performance level for a given unit.
7.3 Confirm and
...
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