hYdraUliC FlUids Hydraulic fluids are used in all industries, agricultural, mining and public works machinery, and represent over 10% of the world s lubricant needs. Often considered as commodity oils, we forget that they are high-performance products, without which a machine cannot function. There exists a large variety of hydraulic fluids, which have different properties in order to meet the requirements of the various applications of the industrial users.
There are some hydraulic fluids offering high-performance products which have numerous properties, the fruit of a quality formulation. Theirpropertiesarepartlyprovidedbytheintrinsicqualityofthebaseoils(deaeration,filterability,viscosityindex),
hence the importance of the selection of the raw materials. Aqualityadditivationisnecessarytoguaranteegoodperformanceofthefluidovertime. Theincreasingtemperatureandpressureconstraintsmeanthatincreasinglyhigherperformancefluidsareproposed.
BRAKE FLUIDS The first vehicles equipped with hydraulic braking systems were launched in 1924. Alcohols, particularly polyhydric alcohols such as glycerol, and glycerol-water mixtures were used as hydraulic fluids. These products didn t match the requirements of today s technology and are only of historical interest.
Currently, there are mainly three classes of brake fluids
The main used today are glycol-ether based, but mineral oil (Citroën Hydraulic Mineral Liquid LHM) and silicone (DOT 5) based fluids are also available. Silicone oils are mainly used on military vehicles in the United States and mineral oils are used for some specific applications (Citroen, Rolls Royce ).
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