The Conostan FT-IR Operational Test Standard is a petroleum-based fluid similar to routine oil samples that are analyzed by Fourier Transform Infrared (FT-IR) spectroscopy as part of a condition-monitoring program. The product looks and handles like the used oil samples routinely tested, and flows through the system to monitor the cell and tubing in addition to providing a known spectrum and test values. The Conostan FT-IR Operational Test Standard validates FT-IR instrument performance and handling procedures to ensure repeatability and reproducibility for fluid condition monitoring programs.

Additionally, it may be used to supplement the ASTM E-1421 FT-IR performance test using polystyrene and is recommended in the pending ATSM draft practice for used oil analysis by FT-IR.