ASTM D2619 – Standard Test Method for Hydrolytic Stability of Hydraulic Fluids (Beverage Bottle Method)
Description:
Significance and Use
4.1 This test method differentiates the relative stability of hydraulic fluids in the presence of water under the conditions of the test. Hydrolytically unstable hydraulic fluids form acidic and insoluble contaminants which can cause hydraulic system malfunctions due to corrosion, valve sticking, or change in viscosity of the fluid. The degree of correlation between this test method and service performance has not been fully determined.
Scope
1.1 This test method2 covers the determination of the hydrolytic stability of petroleum or synthetic-based hydraulic fluids.
Note 1: Water-based or water-emulsion fluids can be evaluated by this test method, but they are run “as is.” Additional water is not added to the 100 g sample. In these cases, the person requesting the test needs to let the test operator know that water is present.
1.2 The values stated in SI units are to be regarded as the standard. The English units given in parentheses are provided for information only.
ASTM D2617