ASTM E2412 Condition Monitoring of In-Service Lubricants by Trend Analysis
ASTM E2412 Standard Practice for Condition Monitoring of In-Service Lubricants by Trend Analysis Using Fourier Transform Infrared (FT-IR) Spectrometry
10. Effects of Oil Formulation
10.1 Differences in oil formulations can affect the results reported for the various measurements described in Annex A1. For example, Fig. 1 shows spectra of four 10W-30 oils in the carbonyl region where oxidation is measured for petroleum lubricants. In this example, absorbances for carbonyl-containing additives in these unused oil formulations contribute nearly a factor of 2 difference in the oxidation result measured by direct trending.

10.2 Results should be:
10.2.1 Interpreted relative to values measured for unused oil of the same formulation, or

10.2.2 Trended directly from the component sample history.

10.3 Distribution profiles for results for different oil formulations should typically not be combined unless justified by field experience in condition monitoring programs.

11. Keywords
11.1 additive packages; base stock degradation; condition monitoring; contamination; Fourier transform infrared; FT-IR; fuel; glycol; infrared; IR; lubricating oils; nitration; oxidation; petroleum based extreme pressure lubricants; petroleum lubricants; polyol ester synthetic lubricants; soot; sulfates; trend analysis; water