Facts about the ASTM E2412 Standard Test Method
The ASTM E2412 test method is a standard practice for Condition Monitoring of Used Lubricants by Trend Analysis using Fourier Transform Infrared (FT-IR) Spectrometry. It covers the use of FT-IR in monitoring additive depletion, contaminant buildup and base stock degradation in machinery lubricants, hydraulic fluids and other fluids used in normal machinery operation.
ASTM E2412 diagnoses the operational condition of the machine based on fault conditions observed in the oil. The results allow operators to replace oil as necessary. (Andreas Schwarzmann, R&D)
Results of ASTM E2412 can be combined with TA, TBN and viscosity data, and give detailed and extensive conclusions on the quality of oil. The test method is not designed for the analysis of lubricant composition, lubricant performance or additive package formulations.
The wavenumber for this test method and multiple lubricant types ranges from 3000 to 1090 cm‾¹, but the exact absorbance intensity will depend on the spectral resolution and the pathlength of the used cell. The maximum absorbance for petroleum based lubricants ranges from 3000 to 2800 cm‾¹ (or transmittance value close to 0 %T). The maximum absorbance for ester based lubricants ranges from 1390 to 1090 cm‾¹ (or transmittance value close to 0 %T).