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Continued from page 18


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.


INDUSTRIAL GEAR OILS Examples of oxidation laboratory tests - BfB


D 2619: Hydrolytic Stability of Hydraulic Fluids (Beverage Bottle Method)


This test method covers the determination of the hydrolytic stability of petroleum or synthetic-based hydraulic fluids. A copper test specimen and 75 g of test fluid plus 25 g of water (or 100 g of a water-containing fluid) are sealed in a pressure- type beverage bottle (Cola bottle which can resist a high pressure). The bottle is rotated, end for end, for 48 hours in an oven at 93°C. This causes the layers to separate and the weight change of the copper specimen is measured. The acid number change of the fluid and acidity of the water layer are determined.


Oxidation of oil at higher temperatures can lead to the formation of sludge and deposits. Viscosity will also increase due to degradation. Sludge and deposits clog oil passages, change heat transfer rates, and deplete additives’ contents. Poor oxidation may thus reduce oil and equipment life. ASTM D-2893 method is used to evaluate oxidation stability of industrial gear oils.


The method ASTM D 5763: Oxidation and Thermal Stability Characteristics of Gear Oils Using Universal Glassware is a modification of D 2893.


D 2893: Oxidation Characteristics of Extreme Pressure Lubricating Oils


This test was developed to measure the high temperature oxidation stability of industrial gear oils. It is important to note that D 2893 was designed to run at 95°C. However, to meet the requirements of U.S. Steel, and AGMA 9005 (American Gear Manufactures Association), the temperature is elevated to


Examples of oxidation laboratory tests - BfB Continued on page 22


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LUBE MAGAZINE NO.141 OCTOBER 2017


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