ABSTRACT
The basic function of hydraulic fluid is to provide a method of power transfer within a hydraulic circuit. Hydraulic fluids must lubricate the pumps, valves, and other components of the system without negatively affecting the overall operation of the total hydraulic circuit. Considering the demands placed on hydraulic fluids, there are several areas that must be addressed when formulating these fluids. Hydraulic fluids must offer the following benefits to the end user of the fluids, at a minimum:
• Protection against corrosion • Protection against rusting • Provide thermal stability • Provide anti-wear protection • Provide oxidation stability
These are some of the key performance indicators used in evaluating hydraulic fluids. With this in mind, there are two primary classifications for hydraulic fluids once they have been developed. These are known as conventional mineral oils and fire resistant hydraulic fluids. In this chapter we review only the segment known as fire-resistant hydraulic fluids.
