FT-IR Measurement of Hydraulic Fluids in Perchloroethylene

An improved solvent-extraction/infrared-analysis technique has been devised to replace an older technique for measuring very small concentrations of nonvolatile residues of industrial hydraulic fluids, oils, and greases on hardware that is required to be cleansed of such residues. The older technique involves solvent extraction of nonvolatile residues followed by gravimetric determination of the quantity of dissolved residues.