Polyalphaolefins have been identified as the most common synthetic base oils. They are used in nearly every type of equipment with the exception of compressors that have high discharge pressures, where they have been known to leave deposits. PAOs are miscible with mineral oils and have good demulsibility characteristics.
Polyalkylene glycol oils are used in some refrigeration compressor systems as well as brake fluids, worm gear oils and gas turbine oils. They are unique in that they don’t form deposits as the oil breaks down. PAGs also have a natural detergency and clean up varnish left behind by other fluids. If the base fluid is made by the polymerization of ethylene oxide, the resulting fluid is water soluble and is often used in water-emulsion hydraulic fluids.
Di-esters are frequently used in compressor applications and are often paired with PAOs to help with additive solubility. Di-esters also tend to be hygroscopic in nature, which means they absorb moisture readily. They have a high viscosity index as well as a low pour point, so these oils will remain fluid at low temperatures.
Silicone base oils have the highest viscosity indexes and some of the highest levels of thermal and oxidative stability. These bases are used primarily in high heat applications and some brake fluids. They are typically very costly. In addition, the oxidation by products are abrasive and can lead to added machine wear. Silicones are also chemically inert, which makes it difficult to blend additives into them and still have them remain in solution.
Overall, synthetic oils can be tremendous assets to any lubrication program, but they must be matched to the machinery’s needs to get the optimum benefit from them. When making the transition from mineral base fluids to a synthetic base, be sure to flush the system to minimize any residual compatibility issues that may remain. By understanding the strengths and weaknesses of the synthetic base you are using, you will be well on your way to achieving all of the advantages associated with these fluids.
Posted by: GREENLube
Posted by: GREENLube
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