ASTM D5621-20
(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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.
1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
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This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: D5621 − 20
Standard Test Method for
1
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* D6022 Practice for Calculation of Permanent Shear Stability
Index
1.1 This test method covers the evaluation of the shear
D7042 Test Method for Dynamic Viscosity and Density of
stability of hydraulic fluids in terms of the final viscosity that
Liquids by Stabinger Viscometer (and the Calculation of
results from irradiating a sample of the hydraulic fluid in a
Kinematic Viscosity)
sonic oscillator.
1.2 Evidence has been presented that a good correlation
3. Summary of Test Method
exists between the shear degradation that results from sonic
2 3.1 Aconvenient volume of hydraulic fluid is irradiated in a
oscillation and that obtained in a vane pump test procedure.
sonic oscillator for a period of time and the viscosities before
1.3 This test method uses millimetres squared per second
and after irradiation are determined by Test Method D445 and
2
(mm /s), an SI unit, as the unit of viscosity. For information,
D7042.Astandard reference fluid containing a readily sheared
the equivalent unit, cSt, is shown in parentheses.
polymer is run frequently to ensure that the equipment imparts
1.4 This standard does not purport to address all of the a controlled amount of sonic energy to the sample.
safety concerns, if any, associated with its use. It is the
3.2 The conditions to obtain the data for the precision
responsibility of the user of this standard to establish appro-
statement were: 30 mL sample, 12.5 min calibration, and
priate safety, health, and environmental practices and deter-
40 min sample irradiation at 0 °C jacket temperature.
mine the applicability of regulatory limitations prior to use.
1.5 This international standard was developed in accor-
4. Significance and Use
dance with internationally recognized principles on standard-
4.1 This test method was developed using Test Method
ization established in the Decision on Principles for the
D2603–91.
Development of International Standards, Guides and Recom-
mendations issued by the World Trade Organization Technical 4.2 Thistestmethodpermitstheevaluationofshearstability
Barriers to Trade (TBT) Committee. with minimum interference from thermal and oxidative factors
that may be present in some applications. It has been found
2. Referenced Documents
applicable to fluids containing both readily sheared and shear-
3
resistant polymers. Correlation with performance in the case of
2.1 ASTM Standards:
hydraulic applications has been established.
D445 Test Method for Kinematic Viscosity of Transparent
and Opaque Liquids (and Calculation of Dynamic Viscos-
5. Apparatus
ity)
D2603 Test Method for Sonic Shear Stability of Polymer-
5.1 Sonic Shear Unit, fixed frequency oscillator and sonic
Containing Oils
horn.
5.2 Auxiliary Equipment—To facilitate uniform
1 performance, the following auxiliary equipment is recom-
This test method is under the jurisdiction of ASTM Committee D02 on
Petroleum Products, Liquid Fuels, and Lubricants and is the direct responsibility of
mended:
Subcommittee D02.07 on Flow Properties.
5.2.1 Cooling Bath or Ice Bath, to maintain a jacket
Current edition approved May 1, 2020. Published May 2020. Originally
temperature of 0 °C.
approved in 1994. Last previous edition approved in 2019 as D5621 – 19. DOI:
5.2.2 Griffın 50 mL Beaker, borosilicate glass.
10.1520/D5621-20.
2
Stambaugh, R. L., Kopko, R. J., and Roland, T. F., “Hydraulic Pump
5.2.3 Sonic-Insulated Box, to enclose the sonic horn to
Performance—A Basis for Fluid Viscosity Classification,” SAE Paper No. 901633.
reduce the ambient noise level produced by the sonic shear
Available from Society of Automotive Engineers, 400 Commonwealth Dr.,
unit.
Warrendale, PA 15096.
3
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
5.3 Viscometer—Any viscometer and bath meeting the re-
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
quirements for determining kinematic viscosity: Test Method
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. D445 or D7042. Whichever method is chosen, that same
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959
...
This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
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: D5621 − 19 D5621 − 20
Standard Test Method for
1
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*
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
2
and that obtained in a vane pump test procedure.
2
1.3 This test method uses millimetres squared per second (mm /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, health, and environmental practices and determine the applicability of
regulatory limitations prior to use.
1.5 This international standard was developed in accordance with internationally recognized principles on standardization
established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued
by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
2. Referenced Documents
3
2.1 ASTM Standards:
D445 Test Method for Kinematic Viscosity of Transparent and Opaque Liquids (and Calculation of Dynamic Viscosity)
D2603 Test Method for Sonic Shear Stability of Polymer-Containing Oils
D6022 Practice for Calculation of Permanent Shear Stability Index
D7042 Test Method for Dynamic Viscosity and Density of Liquids by Stabinger Viscometer (and the Calculation of Kinematic
Viscosity)
3. Summary of Test Method
3.1 A convenient volume of hydraulic fluid is irradiated in a sonic oscillator for a period of time and the viscosities before and
after irradiation are determined by Test Method D445 and D7042. A standard reference fluid containing a readily sheared polymer
is run frequently to ensure that the equipment imparts a controlled amount of sonic energy to the sample.
3.2 The conditions to obtain the data for the precision statement were: 30 mL sample, 12.5 min calibration, and 40 min sample
irradiation at 0 °C jacket temperature.
4. 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.
1
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 June 1, 2019May 1, 2020. Published July 2019May 2020. Originally approved in 1994. Last previous edition approved in 20132019 as
D5621 – 07 (2013).D5621 – 19. DOI: 10.1520/D5621-19.10.1520/D5621-20.
2
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.
3
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.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
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D5621 − 20
5. Apparatus
5.1 Sonic Shear Unit, fixed frequency oscillator and sonic horn.
5.2 Auxiliary Equipment—To facilitate uniform performance, the following auxiliary equipment is recommended:
5.2.1 Cooling Bath or Ice Bath, to maintain a jacket temperature of 0 °C.
5.2.2 Griffın 50 mL Beaker, borosilicate glass.
5.2.3 Sonic-In
...
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