PLTL-30 High Temperature Stability per MIL-PRF-83282, MIL-PRF-87252 and MIL-PRF-87257
During use hydraulic fluids may be exposed to a wide range of temperatures. This test determines changes in viscosity and acid number in hydraulic fluids due strictly to exposure to high temperatures in an oxygen-free atmosphere.
The sample is placed in a round bottomed flask with a small section of stainless-steel tubing which acts as a catalyst. The assembly is heated under a blanket of dry nitrogen for the test time and temperature required. Both the acid number and viscosity are determined before and after heating. The change in acid number and the percent change in viscosity are reported. Observations of sediment formation and discoloration of the catalyst metal are also noted.
Instructions:
Specify temperature