Full Description 1.1 This test method covers a procedure for system evaluation of aerospace hydraulic fluids. The test method recommends control of test variables, a typical test system geometry, data to be obtained, and procedures which will assure a uniform approach to fluid screening and evaluation. Recommendations concerning specific hardware and rigid techniques have been avoided where possible to allow the test method to be used as the state-of-the-art advances. 1.2 Each agency using the test method can simulate a specific system, thus fluids can be qualified for use in applications having unique hardware and design concepts. This approach provides the test flexibility needed to meet the rapid changes in fluid requirements and also provide valuable comparative data for both users and developers of hydraulic fluids. 1.3 Since the test system was purposely generalized, it is important that the specified data be obtained in order that fluid flow dynamics can be defined. Such factors as shear rate, mass flow rate, temperature gradients, etc., must be defined for valid comparisons. 1.4 This standard does not purport to address all of the safety problems, 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.> 1.5 The values stated in metric units are to be regarded as the standard. The values given in parentheses are for information only.
ASTM D2428-92 Referenced Document
ASTM D1298 Standard Test Method for Density, Relative Density (Specific Gravity), or API Gravity of Crude Petroleum and Liquid Petroleum Products by Hydrometer Method*, 1999-04-22 Update
ASTM D1480 Standard Test Method for Density and Relative Density (Specific Gravity) of Viscous Materials by Bingham Pycnometer*, 1993-04-22 Update
ASTM D1481 Standard Test Method for Density and Relative Density (Specific Gravity) of Viscous Materials by Lipkin Bicapillary Pycnometer*, 1993-04-22 Update
ASTM D445 Standard Test Method for Kinematic Viscosity of Transparent and Opaque Liquids (the Calculation of Dynamic Viscosity)*, 1997-04-22 Update
ASTM D664 Standard Test Method for Acid Number of Petroleum Products by Potentiometric Titration*, 1995-04-22 Update
ASTM D88 Standard Test Method for Saybolt Viscosity*, 1994-04-22 Update
ASTM D92 Standard Test Method for Flash and Fire Points by Cleveland Open Cup*, 1998-04-22 Update