We perform quality and conformance lubricants testing by ASTM D2619 to determine 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. This test is similar but not identical to FTM 3457 – Hydrolytic Stability.
We also perform hydrolytic stability testing by Def Stan 05-50 (Part 61) Method 6 and FTM 3457. 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.
