![]() ![]() Antifoam – minimises the formation of bubbles and ‘foaming’, typically silicone base.Corrosion inhibitor – decreases the corrosion rate of a material, typically metals.Copper passivator – binds to copper surfaces and creates an impermeable boundary. ![]() Dispersant – prevents fine particles from settling and building up.Pour point depressant – stops wax crystals forming at low temperatures.Antioxidant – designed to prevent the occurrence of oxidisation (sludge/varnish).Antiwear – prevents metal to metal contact between parts.The additive package, which is added to the base oil in hydraulic fluid has various properties, including Over time, this will block lines, filters and valves. Recycled or remanufactured oil will become sticky and varnish systems more quickly, which leads to sluggish operation and increased wear. Oxidation will occur when oxygen mixes with the oil, as the chemical reaction creates a ‘varnish’ in the hydraulic system, and excessive heat will accelerate this varnishing effect. The benefits of virgin oilĬompared with recycled or remanufactured oil, virgin oil lasts longer and has about a third of the oxidation rate, i.e lasting for 6500 hours as opposed to 2000 hours. There are different quality levels of base oil virgin oil, recycled or manufactured oil, environmentally friendly oils (known as bio oils) and specialist oils, for example, fire resistant hydraulic fluids. What are the different types of base hydraulic oil? ![]()
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