We perform lubricants quality testing by FTM 3457 to measure the hydrolytic stability of hydraulic fluids. This test method covers the determination of the hydrolytic stability of petroleum or synthetic-based hydraulic fluids. This test is commonly referred to as the “Coke Bottle Method”. 75 ml of fluid and 25 ml of water are added to a 7-oz glass beverage bottle (Coke bottle) along with a strip of copper catalyst. The bottle is capped and the assembly is placed in a rotisserie inside a convection oven heated to 93c for 48 hours. At the end of the test, the acid number of the fluid and water layers are reported, along with weight loss and appearance of the copper catalyst. In addition, the insoluble content and viscosity change of the oil are reported. This test is similar but not identical to ASTM D2619 – Hydraulic Fluid Hydrolytic Stability.
We also perform hydrolytic stability testing by ASTM D2619 and Def Stan 05-50 (Part 61) Method 6. These different test methods use different instruments or procedures or are used for certain sample types. Click on the test method number to learn more about each test.
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