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ASTM D 5621 : 2024

ASTM D 5621 : 2024

Current

Current

The latest, up-to-date edition.

Standard Test Method for Sonic Shear Stability of Hydraulic Fluids

Available format(s)

Hardcopy , PDF

Language(s)

English

Published date

05-14-2024

Publisher

American Society for Testing and Materials

Committee
D 02
DocumentType
Test Method
Pages
3
PublisherName
American Society for Testing and Materials
Status
Current
Supersedes

1.1This 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.

1.2Evidence 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

1.3This 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.

1.4Precision of the method has only been determined for hydraulic fluids with irradiated kinematic viscosities between 10 mm2/s and 50 mm2/s or percent viscosity loss between 5 % and 45 %, the ranges covered by the round robin samples.

1.5This 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.

1.6This 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.

ASTM D 6080 : 2018 : REV A Standard Practice for Defining the Viscosity Characteristics of Hydraulic Fluids
ASTM D 6022 : 2019 Standard Practice for Calculation of Permanent Shear Stability Index

ASTM D 445 : 2024 Standard Test Method for Kinematic Viscosity of Transparent and Opaque Liquids (and Calculation of Dynamic Viscosity)

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Hardcopy - English
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